Marius Achim Baciu (born 1 May 1975) is a Romanian former player and current football head coach.

Baciu started his career playing as a youth for Gaz Metan Mediaș, before joining the squad of FC Inter Sibiu as a professional player in 1992. One year later he was loaned to his former team Gaz Metan Mediaș, rejoining FC Inter Sibiu in 1994.

In 1996, FC Inter Sibiu was relegated from Liga I, but Baciu, then 21, was signed by Steaua București winning the championship in 1997 and 1998 and the Cupa României in 1999. After a new championship in 2001, Baciu refused to renew his contract with Steaua and as a result, he was sent to play for the reserves team. During his years at Steaua, Baciu was also the team's captain.

In 2002, he left Steaua to play in France for Lille OSC but after two mediocre seasons he was released from his contract and signed with the German squad Rot-Weiß Oberhausen as a free agent.^[1]

Between 2005 and 2007 he was part of the Oțelul Galați squad. In 2007, Baciu signed a contract with the new promoted U Cluj.

In summer 2011, Baciu signed a two-year contract with Romanian side Politehnica Iași. In August 2011, he was released from his contract. Since he started his coaching career Baciu has achieved great praise for his consistent results specially when taking Vointa Sibiu from second Romanian Division to First Romanian League and keeping the team in the first places in the championship.

While at Concordia Chiajna in 2015, Baciu successfully managed to keep the team away from the relegation in his last season in charge with the team.

Steaua București

• Divizia A: 1996–97, 1997–98, 2000–01
• Cupa României: 1996–97, 1998–99
• Supercupa României: 1998, 2001

Gaz Metan Mediaș

• Liga II: 2007–08,

• Marius Baciu at RomanianSoccer.ro (in Romanian)