Marius De Saeger, born on September 28, 2009, in Brussels, is a Belgian actor who gained recognition for his role as Alexander in the film Young Hearts (2024).

Young Hearts, directed by Anthony Schatteman, is a coming-of-age drama exploring themes of love and self-discovery during adolescence. The film premiered at the 74th Berlinale, where it received an enthusiastic reception.

Marius' performance was widely praised by critics, earning him international recognition. The film won several awards, including distinctions at the New York Lesbian, Gay, Bisexual & Transgender Film Festival, the Seattle International Film Festival, and FilmOut San Diego.

Outside of his film career, Marius shares glimpses of his life on Instagram, where he has a community of over 189,000 followers.

With such a promising start, Marius De Saeger is regarded as one of the most talented young actors in Belgian and international cinema.