| Marius Antonescu | |
| Birth Name: | Marius Constantin Antonescu |
| Birth Place: | Mangalia, Romania |
| Weight: | 109kg (240lb) |
| Ru Position: | Lock |
| Repteam1: | Romania |
| Repyears1: | 2014– |
| Repcaps1: | 28 |
| Reppoints1: | 0 |
| Ru Ntupdate: | 22 November 2017 |
| Province1: | Dinamo București |
| Province2: | Olimpia București |
| Province3: | Tarbes |
| Provinceyears1: | 2012 |
| Provinceyears2: | 2013–14 |
| Provinceyears3: | 2014– |
| Provinceapps1: | 2 |
| Provinceapps2: | 2 |
| Provinceapps3: | 54 |
| Provincepoints1: | 0 |
| Provincepoints2: | 0 |
| Provincepoints3: | 15 |
| Ru Provinceupdate: | 8 December 2016 |
| Birth Date: | 1992 8, df=yes |
Marius Constantin Antonescu (born 9 August 1992) is a Romanian rugby union player. He plays as a lock.
He plays for Tarbes in France.
He has 10 caps for Romania, since his debut in 2014, and still has to score his first points. Antonescu was part of the squad at the 2015 Rugby World Cup, playing a single game, as a substitute.[1]