Carlo De Mejo was the son of musician Oscar De Mejo and actress Alida Valli who enjoyed her greatest period of international success right after Carlo's birth in the later half of the 1940's. Carlo followed his mother into acting, first as a child actor and then as an adult, appearing in mainstream films such as The Cassandra Crossing but mainly making a name for himself in several early 80's Italian B-movies for Lucio Fulci, Luigi Cozzi, and Bruno Mattei.

Filmography

• 2016House of the Tempest — Felix
• 2014H.P. Lovecraft: Two Left Arms
• 1999I fobici — Party guest (segment "Frutto proibito")
• 1984Al limite, cioè non glielo dico
• 1983Women's Prison Massacre — Lawman Harrison
• 1982Manhattan Baby — Luke
• 1981The House by the Cemetery — Mr. Wheatley
• 1981The Other Hell — Father Valerio
• 1980City of the Living Dead — Gerry
• 1980Contamination — Agent Young
• 1980Terror Express — Ernie
• 1980The Inn of Maladolescenza — Andrea Poggi
• 1979Cindy's Love Games
• 1979William Shakespeare's Twelfth Night — Orsinio
• 1978Dirty World — Massimo
• 1977A Simple Heart
• 1976The Cassandra Crossing — Faux Patient
• 1976The Young Bride — Massimo Raimondi
• 1975The Net
• 1973Défense de savoir — Bruno Christiani
• 1973Stateline Motel — Albert
• 1972The Dead Are Alive — Igor Samarakis
• 1972The Outside Man — Karl
• 1972When Women Were Called Virgins — Gisippo
• 1970Microscopic Liquid Subway to Oblivion — Billy
• 1970The Dove Must Not Fly
• 1968Five Days in Sinai — Ylan
• 1968Summit — Ulrich
• 1968Theorem — Lucia's first lover

Appearances as themselves (3)

• 2009Tales from the Rails — self
• 2008Come diventai Alida Valli — Self
• 2008Paura: Lucio Fulci Remembered - Volume 1 — Self