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.

• List of FC Barcelona presidents

• Ptrantl, Harald (27 November 2009). "110 Fakten zu 110 Jahren FC Barcelona" (in German). La Ola.
• "Profile of Otto Gmelin". FC Barcelona.