| Birth Date: | 29 November 1942 |
| Sport: | Rowing |
| Club: | SC Dynamo Berlin[1] |
| Show-Medals: | yes |
Dagmar Holst (born 29 November 1942) is a retired German rower for East Germany who won a gold, a silver and a bronze medal in the quadruple sculls at the European Rowing Championships of 1966, 1968 and 1969, respectively.
After marrying in 1968–1969, Holst competed as Dagmar Seipt or Dagmar Seipt-Holst.