| Christian Vadim | |
| Image Caption: | Vadim and wife Julia Livage in 2012 |
| Birth Name: | Christian Igor Christoph Plemiannikov |
| Birth Date: | 18 June 1963 |
| Birth Place: | France |
| Spouse: | Julia Livage (divorced) Nadège Meziat |
| Children: | 3 |
| Parents: | Roger Vadim Catherine Deneuve |
| Occupation: | actor |
| Years Active: | 1983–present |
| Relatives: | Chiara Mastroianni (half-sister) Maurice Dorléac (grandfather) Renée Simonot (grandmother) Françoise Dorléac (aunt) |
Christian Plemiannikov known as Christian Vadim (born 18 June 1963), is a French actor. He is the son of actress Catherine Deneuve and film director Roger Vadim.
He made his film debut in 1983, working with his father in the film Surprise Party, and appeared in Éric Rohmer's Full Moon in Paris the following year.
In 1999, he played Bloch in Time Regained (directed by Raúl Ruiz), which also starred his mother Catherine Deneuve. He then worked again with Ruiz on Love Torn in a Dream (2000), Savage Souls (2001), A Place Among the Living (2003), That Day (2003) and Night Across the Street (2012).