Has there ever been a 11–1 in all competitions?

Yes, 6 times.

The first time: September 8, 1905, Alumni beat Lomas Athletic (Alumni 11–1 Lomas Athletic) · Primera Argentina.

The last time: November 6, 1982, Borussia Dortmund beat Arminia Bielefeld (Borussia Dortmund 11–1 Arminia Bielefeld) · Bundesliga, 43 years ago.

Home wins: 5. Away wins: 1.

Nearby scores

1. 12–0 7 times
2. 12–1 3 times
3. 12–2 1 time
4. 11–0 5 times
5. 11–1 6 times
6. 11–2 3 times
7. 10–0 25 times
8. 10–1 21 times
9. 10–2 7 times

All games

1. November 6, 1982 Borussia Dortmund 11–1 Arminia Bielefeld · Bundesliga
2. November 27, 1971 Bayern München 11–1 Borussia Dortmund · Bundesliga
3. March 11, 1971 Platense 1–11 Independiente · Primera Argentina
4. June 7, 1942 Boca Juniors 11–1 Tigre · Primera Argentina
5. September 29, 1940 Sevilla FC 11–1 FC Barcelona · La Liga
6. September 8, 1905 Alumni 11–1 Lomas Athletic · Primera Argentina