Marcin Held (born January 18, 1992) is a Polish mixed martial artist who competes in the Lightweight division of Konfrontacja Sztuk Walki (KSW).

[4] Held began his professional mixed martial arts career and compiled a 3–0 record before joining Shooto.

His debut fight for the organisation was at Shooto Poland, where he headlined and defeated Rafal Lasota via TKO (leg injury).

Just prior to the Shooto fight, Held was named as one of the top ten unsigned prospects to watch for 2009.

Following this, Held defeated Przemyslaw Zbiciak via submission (rear naked choke) midway through the first round.

[6] Held's first professional loss came at the hands of Lukasz Sajewski, a fellow highly rated prospect from Poland.

Sajewski was able to neutralise the submission game of Held, before gaining top position and riding out a unanimous decision victory.

[8] Held was scheduled to participate in the inaugural event of a new Polish promotion - Infinite Fighting Federation - in October in Dąbrowa Górnicza, against German fighter Franco de Leonardis.

According to mmarocks, Held signed a contract to compete against Juha-Pekka Vainikainen in November at Iron Fist 3.

On October 14, Held signed with Bellator MMA to compete in their Season Four Lightweight Tournament.

He faced Rich Clementi in the semifinals on November 16, 2012, at Bellator 81 and won via submission in the second round.

[19] Despite popping Brooks' knee in the opening round, Held lost the fight via unanimous decision.

[22] Held made his promotional debut against UFC veteran Diego Sanchez on November 5, 2016, at The Ultimate Fighter Latin America 3 Finale.

[23] Despite having some success with his boxing and remaining active off his back looking for submissions, Held lost the bout by unanimous decision.

[45] In his sophomore performance, Held faced Roman Szymański on June 7, 2024 at KSW 95, winning the bout via unanimous decision.

[48] Held then competed in the under 80 kg division of the Ocean BJJ Pro Championship on September 21, 2024.