diff --git a/src/routes/api/matrix-space/members/+server.ts b/src/routes/api/matrix-space/members/+server.ts
new file mode 100644
index 0000000..9d6d4db
--- /dev/null
+++ b/src/routes/api/matrix-space/members/+server.ts
@@ -0,0 +1,186 @@
+import { json } from '@sveltejs/kit';
+import type { RequestHandler } from './$types';
+
+const db = (supabase: any) => supabase;
+
+/**
+ * POST: Invite a user to the org's Matrix Space (and its child rooms).
+ * 
+ * Body: { org_id, matrix_user_id, homeserver_url, access_token }
+ */
+export const POST: RequestHandler = async ({ request, locals }) => {
+	const session = await locals.safeGetSession();
+	if (!session.user) {
+		return json({ error: 'Unauthorized' }, { status: 401 });
+	}
+
+	const body = await request.json();
+	const { org_id, matrix_user_id, homeserver_url, access_token } = body;
+
+	if (!org_id || !matrix_user_id || !homeserver_url || !access_token) {
+		return json({ error: 'Missing required fields' }, { status: 400 });
+	}
+
+	// Get org's Matrix Space ID
+	const { data: org } = await db(locals.supabase)
+		.from('organizations')
+		.select('matrix_space_id')
+		.eq('id', org_id)
+		.single();
+
+	if (!org?.matrix_space_id) {
+		return json({ error: 'Organization has no Matrix Space' }, { status: 404 });
+	}
+
+	const spaceId = org.matrix_space_id;
+	const errors: string[] = [];
+
+	// Invite to the Space itself
+	const inviteRes = await matrixInvite(homeserver_url, access_token, spaceId, matrix_user_id);
+	if (!inviteRes.ok) {
+		const err = await inviteRes.json().catch(() => ({}));
+		// M_FORBIDDEN means already joined, which is fine
+		if (err.errcode !== 'M_FORBIDDEN') {
+			errors.push(`Space invite: ${err.error || 'failed'}`);
+		}
+	}
+
+	// Also invite to all child rooms of the space
+	try {
+		const stateRes = await fetch(
+			`${homeserver_url}/_matrix/client/v3/rooms/${encodeURIComponent(spaceId)}/state`,
+			{
+				headers: { 'Authorization': `Bearer ${access_token}` },
+			}
+		);
+
+		if (stateRes.ok) {
+			const stateEvents = await stateRes.json();
+			const childRoomIds = stateEvents
+				.filter((e: any) => e.type === 'm.space.child' && e.content?.via)
+				.map((e: any) => e.state_key);
+
+			for (const childRoomId of childRoomIds) {
+				const childInvite = await matrixInvite(homeserver_url, access_token, childRoomId, matrix_user_id);
+				if (!childInvite.ok) {
+					const err = await childInvite.json().catch(() => ({}));
+					if (err.errcode !== 'M_FORBIDDEN') {
+						errors.push(`Room ${childRoomId}: ${err.error || 'failed'}`);
+					}
+				}
+			}
+		}
+	} catch (e) {
+		errors.push('Failed to fetch space children');
+	}
+
+	return json({
+		success: errors.length === 0,
+		invited: matrix_user_id,
+		spaceId,
+		errors: errors.length > 0 ? errors : undefined,
+	});
+};
+
+/**
+ * DELETE: Kick a user from the org's Matrix Space (and its child rooms).
+ * 
+ * Query: ?org_id=...&matrix_user_id=...&homeserver_url=...&access_token=...
+ */
+export const DELETE: RequestHandler = async ({ url, locals }) => {
+	const session = await locals.safeGetSession();
+	if (!session.user) {
+		return json({ error: 'Unauthorized' }, { status: 401 });
+	}
+
+	const org_id = url.searchParams.get('org_id');
+	const matrix_user_id = url.searchParams.get('matrix_user_id');
+	const homeserver_url = url.searchParams.get('homeserver_url');
+	const access_token = url.searchParams.get('access_token');
+
+	if (!org_id || !matrix_user_id || !homeserver_url || !access_token) {
+		return json({ error: 'Missing required fields' }, { status: 400 });
+	}
+
+	const { data: org } = await db(locals.supabase)
+		.from('organizations')
+		.select('matrix_space_id')
+		.eq('id', org_id)
+		.single();
+
+	if (!org?.matrix_space_id) {
+		return json({ error: 'Organization has no Matrix Space' }, { status: 404 });
+	}
+
+	const spaceId = org.matrix_space_id;
+	const errors: string[] = [];
+
+	// Kick from child rooms first, then from the space
+	try {
+		const stateRes = await fetch(
+			`${homeserver_url}/_matrix/client/v3/rooms/${encodeURIComponent(spaceId)}/state`,
+			{
+				headers: { 'Authorization': `Bearer ${access_token}` },
+			}
+		);
+
+		if (stateRes.ok) {
+			const stateEvents = await stateRes.json();
+			const childRoomIds = stateEvents
+				.filter((e: any) => e.type === 'm.space.child' && e.content?.via)
+				.map((e: any) => e.state_key);
+
+			for (const childRoomId of childRoomIds) {
+				const kickRes = await matrixKick(homeserver_url, access_token, childRoomId, matrix_user_id);
+				if (!kickRes.ok) {
+					const err = await kickRes.json().catch(() => ({}));
+					if (err.errcode !== 'M_FORBIDDEN') {
+						errors.push(`Room ${childRoomId}: ${err.error || 'failed'}`);
+					}
+				}
+			}
+		}
+	} catch (e) {
+		errors.push('Failed to fetch space children');
+	}
+
+	// Kick from the space itself
+	const kickRes = await matrixKick(homeserver_url, access_token, spaceId, matrix_user_id);
+	if (!kickRes.ok) {
+		const err = await kickRes.json().catch(() => ({}));
+		if (err.errcode !== 'M_FORBIDDEN') {
+			errors.push(`Space kick: ${err.error || 'failed'}`);
+		}
+	}
+
+	return json({
+		success: errors.length === 0,
+		kicked: matrix_user_id,
+		spaceId,
+		errors: errors.length > 0 ? errors : undefined,
+	});
+};
+
+// Helper: invite a user to a room
+async function matrixInvite(homeserver: string, token: string, roomId: string, userId: string) {
+	return fetch(`${homeserver}/_matrix/client/v3/rooms/${encodeURIComponent(roomId)}/invite`, {
+		method: 'POST',
+		headers: {
+			'Authorization': `Bearer ${token}`,
+			'Content-Type': 'application/json',
+		},
+		body: JSON.stringify({ user_id: userId }),
+	});
+}
+
+// Helper: kick a user from a room
+async function matrixKick(homeserver: string, token: string, roomId: string, userId: string) {
+	return fetch(`${homeserver}/_matrix/client/v3/rooms/${encodeURIComponent(roomId)}/kick`, {
+		method: 'POST',
+		headers: {
+			'Authorization': `Bearer ${token}`,
+			'Content-Type': 'application/json',
+		},
+		body: JSON.stringify({ user_id: userId, reason: 'Removed from organization' }),
+	});
+}