| Otto Gmeling | |
| Office: | 9th President of FC Barcelona |
| Term Start: | 14 October 1909 |
| Term End: | 17 November 1910 |
| Successor: | Joan Gamper |
| Birth Date: | 5 July 1876 |
| Birth Place: | Wangen im Allgäu, Germany |
| Death Place: | Esslingen am Neckar, Germany |
Otto Gmeling or Gmelin, also known as Grand Otto (5 July 1876 – 29 October 1925), was a German and president of FC Barcelona from 1909–1910.
He was president of the club when they won their first domestic title, the Copa del Rey in 1910. They also won a Catalan championship undefeated and their first Pyrenees Cup.
Under Gmelings presidency, the club gained a gradual increase in the number of spectators who came to watch the games, which marked the transition from amateur to professional football.