| Intro | Dutch swimmer |
| A.K.A. | J.C. Sikkens, Jacoba Catharina Sikkens, Coby Sikkens |
| Is |
Athlete Swimmer |
| From | Netherlands |
| Type | Sports |
| Gender | female |
| Birth | 11 May 1946, Groningen |
| Age: | 74 years |
Jacoba Catharina “Coby” Sikkens (born 11 May 1946 in Groningen) is a retired Dutch backstroke swimmer who won a gold medal in 4 × 100 m medley at the 1966 European Aquatics Championships. She also participated in the 1968 Summer Olympics.