diff --git a/scripts/add-leaderboard-teams-to-tournament.ts b/scripts/add-leaderboard-teams-to-tournament.ts
new file mode 100644
index 000000000..36311e22b
--- /dev/null
+++ b/scripts/add-leaderboard-teams-to-tournament.ts
@@ -0,0 +1,142 @@
+import "dotenv/config";
+import * as LeaderboardRepository from "~/features/leaderboards/LeaderboardRepository.server";
+import * as Seasons from "~/features/mmr/core/Seasons";
+import { joinTeam } from "~/features/tournament/queries/joinLeaveTeam.server";
+import * as TournamentTeamRepository from "~/features/tournament/TournamentTeamRepository.server";
+import { tournamentFromDB } from "~/features/tournament-bracket/core/Tournament.server";
+import * as UserRepository from "~/features/user-page/UserRepository.server";
+import invariant from "~/utils/invariant";
+import { logger } from "~/utils/logger";
+
+const tournamentIdArg = process.argv[2]?.trim();
+const placementsArg = process.argv[3]?.trim();
+
+invariant(tournamentIdArg, "tournamentId is required (argument 1)");
+invariant(placementsArg, "placements are required (argument 2), e.g. 1,2,3");
+
+const tournamentId = Number(tournamentIdArg);
+invariant(
+	Number.isInteger(tournamentId) && tournamentId > 0,
+	"tournamentId must be a positive integer",
+);
+
+const placements = placementsArg.split(",").map((p) => Number(p.trim()));
+for (const p of placements) {
+	invariant(
+		Number.isInteger(p) && p > 0,
+		`each placement must be a positive integer, got: ${p}`,
+	);
+}
+
+async function loadTournament() {
+	try {
+		return await tournamentFromDB({
+			user: undefined,
+			tournamentId,
+		});
+	} catch {
+		throw new Error(`Tournament with id ${tournamentId} not found`);
+	}
+}
+
+async function main() {
+	const tournament = await loadTournament();
+
+	invariant(!tournament.hasStarted, "Tournament has already started");
+
+	const season = Seasons.currentOrPrevious();
+	invariant(season, "No current or previous season found");
+
+	const leaderboard = await LeaderboardRepository.teamLeaderboardBySeason({
+		season: season.nth,
+		onlyOneEntryPerUser: true,
+	});
+
+	const entries = placements.map((placement) => {
+		const entry = leaderboard.find((e) => e.placementRank === placement);
+		invariant(entry, `No leaderboard entry found for placement #${placement}`);
+		return entry;
+	});
+
+	const existingTeamNames = new Set(tournament.ctx.teams.map((t) => t.name));
+
+	let teamNameCounter = 1;
+	const resolvedNames = entries.map((entry) => {
+		return entry.team?.name ?? `Team ${teamNameCounter++}`;
+	});
+
+	for (let i = 0; i < entries.length; i++) {
+		const entry = entries[i];
+		const teamName = resolvedNames[i];
+
+		for (const member of entry.members) {
+			const existingTeam = tournament.teamMemberOfByUser({ id: member.id });
+			invariant(
+				!existingTeam,
+				`User ${member.username} (id: ${member.id}) is already on team "${existingTeam?.name}"`,
+			);
+
+			const user = await UserRepository.findLeanById(member.id);
+			invariant(user, `User with id ${member.id} not found`);
+			invariant(user.friendCode, `User ${member.username} has no friend code`);
+
+			if (tournament.ctx.settings.requireInGameNames) {
+				const inGameName = await UserRepository.inGameNameByUserId(member.id);
+				invariant(
+					inGameName,
+					`User ${member.username} has no in-game name (required by tournament)`,
+				);
+			}
+		}
+
+		invariant(
+			!existingTeamNames.has(teamName),
+			`Team name "${teamName}" is already taken in the tournament`,
+		);
+		existingTeamNames.add(teamName);
+	}
+
+	for (let i = 0; i < entries.length; i++) {
+		const entry = entries[i];
+		const teamName = resolvedNames[i];
+		const owner = entry.members[0];
+
+		const ownerInGameName = tournament.ctx.settings.requireInGameNames
+			? await UserRepository.inGameNameByUserId(owner.id)
+			: null;
+
+		const tournamentTeam = await TournamentTeamRepository.create({
+			team: {
+				name: teamName,
+				prefersNotToHost: 0,
+				teamId: entry.team?.id ?? null,
+			},
+			userId: owner.id,
+			tournamentId,
+			ownerInGameName: ownerInGameName ?? null,
+		});
+
+		for (const member of entry.members.slice(1)) {
+			const memberInGameName = tournament.ctx.settings.requireInGameNames
+				? await UserRepository.inGameNameByUserId(member.id)
+				: null;
+
+			joinTeam({
+				newTeamId: tournamentTeam.id,
+				userId: member.id,
+				inGameName: memberInGameName ?? null,
+				tournamentId,
+			});
+		}
+
+		logger.info(
+			`Created team "${teamName}" (placement #${entry.placementRank}) with members: ${entry.members.map((m) => m.username).join(", ")}`,
+		);
+	}
+
+	logger.info(
+		`Done. Added ${entries.length} teams to tournament ${tournamentId}`,
+	);
+}
+
+void main();