Powde Blue - Jessica Biel
My Week with Marilyn - Michelle Williams
My Week with Marilyn - Emma Watson
Birdsong - Clémence Poésy
As for the following films, his role in the Jupiter Ascending might be different (we don't know almost anything about it, because of the great secrecy), but there is also a love story in the Theory of Everything.
Among the actresses who played his loves in movies, there are big Hollywood stars too.
Eddie Redmayne said about the women he's worked with: "I've played quite a few gay characters and when I manage to play straight ones I've been very fortunate to have incredibly beautiful love interests."
"I have a quite of sort of varied life, but certainly through Marilyn and Les Mis I am definitely doing love-struck, and I don’t know why that is.” (gifs from sirredmayne) (link2)