Until September is a 1984 romantic drama film directed by Richard Marquand and starring Karen Allen and Thierry Lhermitte.

When she misses her plane home, she ends up being stuck in Paris for a while until her visa gets approved and goes to stay at the apartment of a friend who is away for the summer.

There she meets Xavier de la Perouse (Thierry Lhermitte), a wealthy French banker.

Janice Lee Graham wrote the screenplay based on the eleven years she lived in Paris.

After being hired as a secretary for 20th Century Fox executive Edward S. Feldman she sold the script to Michael Gruskoff in 1982.