| Term Start: | 18 March 2003 |
| Term End: | 13 November 2007 |
| Successor: | Thor Pedersen |
| Term Start1: | 9 September 1987 |
| Term End1: | 13 November 2007 |
| Birth Date: | 31 December 1939 |
| Occupation: | Farmer |
Christian Mejdahl (born 31 December 1939 at Tvøroyri in the Faroe Islands) is a Danish politician representing the liberal party, Venstre. He was a Member of Parliament - the Folketing - from 9 September 1987 to 13 November 2007, and served as Speaker of the Folketing from 18 March 2003.
He lives in Løgstør in Himmerland.