| Birth Date: | 19 August 1892 |
| Birth Place: | Bad Cannstatt, German Empire |
| Death Place: | Bad Cannstatt, West Germany |
Otto Fahr (pronounced as /de/; August 19, 1892 - February 28, 1969) was a German backstroke swimmer, who competed in the 1912 Summer Olympics. He was born and died in Bad Cannstatt. Fahr participated in only one event and won the silver medal in the 100 metre backstroke competition.[1]