diff --git a/app/admin/guests/[id]/actions.ts b/app/admin/guests/[id]/actions.ts
index 2114217..c66b838 100644
--- a/app/admin/guests/[id]/actions.ts
+++ b/app/admin/guests/[id]/actions.ts
@@ -6,13 +6,26 @@ import { redirect } from "next/navigation"
 import { auth } from "@/auth"
 import { isAdminEmail } from "@/lib/admin-auth"
 import { deleteInvitationGroup } from "@/lib/db/queries/invitations"
+import {
+  deleteInvitationMember,
+  updateInvitationMemberName,
+} from "@/lib/db/queries/members"
 import { deleteUploadObject } from "@/lib/storage/uploads"
 import { deleteInvitationSchema } from "@/lib/validation/invitation"
+import {
+  deleteInvitationMemberSchema,
+  updateInvitationMemberSchema,
+} from "@/lib/validation/member"
 
 export interface DeleteInvitationActionState {
   error: string | null
 }
 
+export interface MemberActionState {
+  error: string | null
+  success: boolean
+}
+
 export async function deleteInvitationAction(
   _previousState: DeleteInvitationActionState,
   formData: FormData,
@@ -62,3 +75,82 @@ export async function deleteInvitationAction(
   revalidatePath("/admin/guests")
   redirect("/admin/guests?deleted=1")
 }
+
+export async function updateInvitationMemberAction(
+  _previousState: MemberActionState,
+  formData: FormData,
+): Promise<MemberActionState> {
+  const session = await auth()
+  const adminEmail = session?.user?.email
+
+  if (!isAdminEmail(adminEmail)) {
+    return { error: "You are not allowed to edit guest members.", success: false }
+  }
+  const authorizedAdminEmail = adminEmail ?? ""
+
+  const parsed = updateInvitationMemberSchema.safeParse({
+    invitationId: formData.get("invitationId")?.toString(),
+    memberId: formData.get("memberId")?.toString(),
+    name: formData.get("name")?.toString(),
+  })
+
+  if (!parsed.success) return { error: "Enter a valid member name.", success: false }
+
+  try {
+    const result = await updateInvitationMemberName({
+      ...parsed.data,
+      adminEmail: authorizedAdminEmail,
+    })
+
+    if (result.status === "not_found") {
+      return { error: "This guest member was not found.", success: false }
+    }
+  } catch (error) {
+    console.error("Failed to update invitation member", error)
+    return { error: "Could not update this guest member. Please try again.", success: false }
+  }
+
+  revalidatePath(`/admin/guests/${parsed.data.invitationId}`)
+  revalidatePath("/admin/guests")
+  revalidatePath("/admin")
+  return { error: null, success: true }
+}
+
+export async function deleteInvitationMemberAction(
+  _previousState: MemberActionState,
+  formData: FormData,
+): Promise<MemberActionState> {
+  const session = await auth()
+  const adminEmail = session?.user?.email
+
+  if (!isAdminEmail(adminEmail)) {
+    return { error: "You are not allowed to delete guest members.", success: false }
+  }
+  const authorizedAdminEmail = adminEmail ?? ""
+
+  const parsed = deleteInvitationMemberSchema.safeParse({
+    invitationId: formData.get("invitationId")?.toString(),
+    memberId: formData.get("memberId")?.toString(),
+  })
+
+  if (!parsed.success) return { error: "Could not delete this guest member.", success: false }
+
+  try {
+    const result = await deleteInvitationMember({ ...parsed.data, adminEmail: authorizedAdminEmail })
+
+    if (result.status === "not_found") {
+      return { error: "This guest member was already removed.", success: false }
+    }
+    if (result.status === "last_member") {
+      return { error: "A guest group must have at least one member.", success: false }
+    }
+  } catch (error) {
+    console.error("Failed to delete invitation member", error)
+    return { error: "Could not delete this guest member. Please try again.", success: false }
+  }
+
+  revalidatePath(`/admin/guests/${parsed.data.invitationId}`)
+  revalidatePath("/admin/guests")
+  revalidatePath("/admin")
+  return { error: null, success: true }
+}
diff --git a/app/admin/guests/[id]/page.tsx b/app/admin/guests/[id]/page.tsx
index 878cb32..016628e 100644
--- a/app/admin/guests/[id]/page.tsx
+++ b/app/admin/guests/[id]/page.tsx
@@ -4,6 +4,7 @@ import { notFound } from "next/navigation"
 import { CopyInviteButton } from "@/components/admin/copy-invite-button"
 import { DeleteInvitationDialog } from "@/components/admin/delete-invitation-dialog"
 import { InvitationLanguageSelect } from "@/components/admin/invitation-language-select"
+import { MemberManagement } from "@/components/admin/member-management"
 import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert"
 import { Badge } from "@/components/ui/badge"
 import { Button } from "@/components/ui/button"
@@ -195,6 +196,7 @@ export default async function GuestDetailPage({
                 <TableHead>Attending</TableHead>
                 <TableHead>Meal</TableHead>
                 <TableHead>Dietary restrictions</TableHead>
+                <TableHead className="text-right">Actions</TableHead>
               </TableRow>
             </TableHeader>
             <TableBody>
@@ -205,6 +207,14 @@ export default async function GuestDetailPage({
                   <TableCell>{formatBoolean(member.attending)}</TableCell>
                   <TableCell>{member.meal_preference ?? "—"}</TableCell>
                   <TableCell>{member.dietary_restrictions ?? "—"}</TableCell>
+                  <TableCell className="text-right">
+                    <MemberManagement
+                      invitationId={detail.invitation.id}
+                      memberId={member.id}
+                      memberName={member.name}
+                      canDelete={detail.members.length > 1}
+                    />
+                  </TableCell>
                 </TableRow>
               ))}
             </TableBody>
diff --git a/components/admin/member-management.tsx b/components/admin/member-management.tsx
new file mode 100644
index 0000000..7b6edd8
--- /dev/null
+++ b/components/admin/member-management.tsx
@@ -0,0 +1,139 @@
+"use client"
+
+import { useState } from "react"
+import { useRouter } from "next/navigation"
+
+import {
+  deleteInvitationMemberAction,
+  updateInvitationMemberAction,
+} from "@/app/admin/guests/[id]/actions"
+import {
+  AlertDialog,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+  AlertDialogTrigger,
+} from "@/components/ui/alert-dialog"
+import { Button } from "@/components/ui/button"
+import { Input } from "@/components/ui/input"
+
+interface MemberManagementProps {
+  invitationId: string
+  memberId: string
+  memberName: string
+  canDelete: boolean
+}
+
+function SubmitButton({ children, variant = "default", pending }: { children: React.ReactNode; variant?: "default" | "destructive"; pending: boolean }) {
+  return (
+    <Button type="submit" variant={variant} disabled={pending}>
+      {pending ? "Saving..." : children}
+    </Button>
+  )
+}
+
+export function MemberManagement({
+  invitationId,
+  memberId,
+  memberName,
+  canDelete,
+}: MemberManagementProps) {
+  const router = useRouter()
+  const [editOpen, setEditOpen] = useState(false)
+  const [deleteOpen, setDeleteOpen] = useState(false)
+  const [name, setName] = useState(memberName)
+  const [editError, setEditError] = useState<string | null>(null)
+  const [deleteError, setDeleteError] = useState<string | null>(null)
+  const [pendingAction, setPendingAction] = useState<"edit" | "delete" | null>(null)
+
+  async function submitEdit(event: React.FormEvent<HTMLFormElement>) {
+    event.preventDefault()
+    setPendingAction("edit")
+    setEditError(null)
+    const result = await updateInvitationMemberAction({ error: null, success: false }, new FormData(event.currentTarget))
+    setPendingAction(null)
+    if (result.error) {
+      setEditError(result.error)
+      return
+    }
+    setEditOpen(false)
+    router.refresh()
+  }
+
+  async function submitDelete(event: React.FormEvent<HTMLFormElement>) {
+    event.preventDefault()
+    setPendingAction("delete")
+    setDeleteError(null)
+    const result = await deleteInvitationMemberAction({ error: null, success: false }, new FormData(event.currentTarget))
+    setPendingAction(null)
+    if (result.error) {
+      setDeleteError(result.error)
+      return
+    }
+    setDeleteOpen(false)
+    router.refresh()
+  }
+
+  return (
+    <div className="flex flex-wrap gap-2">
+      <AlertDialog open={editOpen} onOpenChange={setEditOpen}>
+        <AlertDialogTrigger asChild>
+          <Button type="button" size="sm" variant="outline">Edit</Button>
+        </AlertDialogTrigger>
+        <AlertDialogContent>
+          <form onSubmit={submitEdit} className="space-y-4">
+            <input type="hidden" name="invitationId" value={invitationId} />
+            <input type="hidden" name="memberId" value={memberId} />
+            <AlertDialogHeader>
+              <AlertDialogTitle>Edit guest member</AlertDialogTitle>
+              <AlertDialogDescription>Update the member&apos;s name.</AlertDialogDescription>
+            </AlertDialogHeader>
+            <Input
+              name="name"
+              value={name}
+              onChange={(event) => setName(event.target.value)}
+              aria-label="Member name"
+              autoFocus
+              maxLength={200}
+              required
+            />
+            {editError ? <p className="text-sm text-destructive">{editError}</p> : null}
+            <AlertDialogFooter>
+              <AlertDialogCancel type="button">Cancel</AlertDialogCancel>
+              <SubmitButton pending={pendingAction === "edit"}>Save changes</SubmitButton>
+            </AlertDialogFooter>
+          </form>
+        </AlertDialogContent>
+      </AlertDialog>
+
+      {canDelete ? (
+        <AlertDialog open={deleteOpen} onOpenChange={setDeleteOpen}>
+          <AlertDialogTrigger asChild>
+            <Button type="button" size="sm" variant="destructive">Delete</Button>
+          </AlertDialogTrigger>
+          <AlertDialogContent>
+            <form onSubmit={submitDelete} className="space-y-4">
+              <input type="hidden" name="invitationId" value={invitationId} />
+              <input type="hidden" name="memberId" value={memberId} />
+              <AlertDialogHeader>
+                <AlertDialogTitle>Delete {memberName}?</AlertDialogTitle>
+                <AlertDialogDescription>
+                  This removes the member from the invitation. If they are the primary contact,
+                  another member will become primary.
+                </AlertDialogDescription>
+              </AlertDialogHeader>
+              {deleteError ? <p className="text-sm text-destructive">{deleteError}</p> : null}
+              <AlertDialogFooter>
+                <AlertDialogCancel type="button">Cancel</AlertDialogCancel>
+                <SubmitButton variant="destructive" pending={pendingAction === "delete"}>Delete member</SubmitButton>
+              </AlertDialogFooter>
+            </form>
+          </AlertDialogContent>
+        </AlertDialog>
+      ) : null}
+    </div>
+  )
+}
diff --git a/lib/db/queries/members.ts b/lib/db/queries/members.ts
index aadd9b8..61992d8 100644
--- a/lib/db/queries/members.ts
+++ b/lib/db/queries/members.ts
@@ -1,5 +1,11 @@
 import { db } from "@/lib/db/client"
 
+export type MemberMutationResult =
+  | { status: "updated"; memberId: string }
+  | { status: "deleted"; memberId: string }
+  | { status: "not_found" }
+  | { status: "last_member" }
+
 export async function listInvitationMembers(invitationId: string) {
   return db
     .selectFrom("invitation_members")
@@ -9,3 +15,152 @@ export async function listInvitationMembers(invitationId: string) {
     .orderBy("created_at", "asc")
     .execute()
 }
+
+export async function updateInvitationMemberName({
+  invitationId,
+  memberId,
+  name,
+  adminEmail,
+}: {
+  invitationId: string
+  memberId: string
+  name: string
+  adminEmail: string
+}): Promise<MemberMutationResult> {
+  return db.transaction().execute(async (trx) => {
+    const member = await trx
+      .selectFrom("invitation_members")
+      .innerJoin("invitations", "invitations.id", "invitation_members.invitation_id")
+      .select(["invitation_members.id", "invitation_members.name", "invitations.display_name"])
+      .where("invitation_members.id", "=", memberId)
+      .where("invitation_members.invitation_id", "=", invitationId)
+      .executeTakeFirst()
+
+    if (!member) return { status: "not_found" }
+
+    const updated = await trx
+      .updateTable("invitation_members")
+      .set({ name, updated_at: new Date() })
+      .where("id", "=", memberId)
+      .where("invitation_id", "=", invitationId)
+      .returning("id")
+      .executeTakeFirst()
+
+    if (!updated) return { status: "not_found" }
+
+    await trx
+      .updateTable("invitations")
+      .set({ updated_at: new Date() })
+      .where("id", "=", invitationId)
+      .execute()
+
+    await trx
+      .insertInto("admin_audit_events")
+      .values({
+        admin_email: adminEmail,
+        action: "invitation_member.updated",
+        target_type: "invitation_member",
+        target_id: memberId,
+        metadata: {
+          invitationId,
+          displayName: member.display_name,
+          previousName: member.name,
+          newName: name,
+        },
+      })
+      .execute()
+
+    return { status: "updated", memberId }
+  })
+}
+
+export async function deleteInvitationMember({
+  invitationId,
+  memberId,
+  adminEmail,
+}: {
+  invitationId: string
+  memberId: string
+  adminEmail: string
+}): Promise<MemberMutationResult> {
+  return db.transaction().execute(async (trx) => {
+    const member = await trx
+      .selectFrom("invitation_members")
+      .innerJoin("invitations", "invitations.id", "invitation_members.invitation_id")
+      .select([
+        "invitation_members.id",
+        "invitation_members.name",
+        "invitation_members.is_primary_contact",
+        "invitations.display_name",
+      ])
+      .where("invitation_members.id", "=", memberId)
+      .where("invitation_members.invitation_id", "=", invitationId)
+      .executeTakeFirst()
+
+    if (!member) return { status: "not_found" }
+
+    const count = await trx
+      .selectFrom("invitation_members")
+      .select((eb) => eb.fn.countAll<string>().as("count"))
+      .where("invitation_id", "=", invitationId)
+      .executeTakeFirstOrThrow()
+    const memberCount = Number(count.count)
+
+    if (memberCount <= 1) return { status: "last_member" }
+
+    let promotedMemberId: string | null = null
+    if (member.is_primary_contact) {
+      const replacement = await trx
+        .selectFrom("invitation_members")
+        .select(["id"])
+        .where("invitation_id", "=", invitationId)
+        .where("id", "!=", memberId)
+        .orderBy("created_at", "asc")
+        .executeTakeFirst()
+
+      if (replacement) {
+        promotedMemberId = replacement.id
+        await trx
+          .updateTable("invitation_members")
+          .set({ is_primary_contact: true, updated_at: new Date() })
+          .where("id", "=", replacement.id)
+          .execute()
+      }
+    }
+
+    const deleted = await trx
+      .deleteFrom("invitation_members")
+      .where("id", "=", memberId)
+      .where("invitation_id", "=", invitationId)
+      .returning("id")
+      .executeTakeFirst()
+
+    if (!deleted) return { status: "not_found" }
+
+    await trx
+      .updateTable("invitations")
+      .set({ updated_at: new Date() })
+      .where("id", "=", invitationId)
+      .execute()
+
+    await trx
+      .insertInto("admin_audit_events")
+      .values({
+        admin_email: adminEmail,
+        action: "invitation_member.deleted",
+        target_type: "invitation_member",
+        target_id: memberId,
+        metadata: {
+          invitationId,
+          displayName: member.display_name,
+          name: member.name,
+          wasPrimary: member.is_primary_contact,
+          promotedMemberId,
+          remainingMembers: memberCount - 1,
+        },
+      })
+      .execute()
+
+    return { status: "deleted", memberId }
+  })
+}
diff --git a/lib/validation/member.ts b/lib/validation/member.ts
new file mode 100644
index 0000000..c427317
--- /dev/null
+++ b/lib/validation/member.ts
@@ -0,0 +1,17 @@
+import { z } from "zod"
+
+const memberName = z.string().trim().min(1, "Member name is required").max(200, "Member name is too long")
+
+export const updateInvitationMemberSchema = z.object({
+  invitationId: z.uuid(),
+  memberId: z.uuid(),
+  name: memberName,
+})
+
+export const deleteInvitationMemberSchema = z.object({
+  invitationId: z.uuid(),
+  memberId: z.uuid(),
+})
+
+export type UpdateInvitationMemberInput = z.infer<typeof updateInvitationMemberSchema>
+export type DeleteInvitationMemberInput = z.infer<typeof deleteInvitationMemberSchema>