| Otto Gunnar Danielsen | |
| Nationality: | Danish |
| Sport: | Sailing |
| Birth Date: | 4 February 1911 |
| Birth Place: | Copenhagen, Denmark |
Otto Gunnar Danielsen (4 February 1911 - 13 March 1958) was a Danish sailor. He competed in the 8 Metre event at the 1936 Summer Olympics.[1]