Geraldine Cowper (born 23 June 1958) is an English actress who is best known for playing Lisa in Only Fools and Horses and Rowan Morrison in the 1973 horror film The Wicker Man and Rosie Miller in EastEnders.
In the mid-1980s she took the part of Clare France in After Henry on BBC radio and also appeared on television as Jim Hacker's daughter in Yes Minister.
Cowper was Clare France, the youngest of the female triumvirate in the BBC Radio 4 comedy After Henry, which also starred Prunella Scales and Joan Sanderson.
She featured in two episodes of Only Fools and Horses – "Tea for Three" and "The Frog's Legacy" – as Trigger's niece Lisa, and also appeared in Bachelor Father.
In her early teens, Cowper made an uncredited appearance in Alfred Hitchcock's Frenzy (1972) and played Rowan Morrison in the horror film The Wicker Man (1973).