Mercury Steam Entertainment S.L., doing business as MercurySteam, is a Spanish video game developer based in San Sebastián de los Reyes, Madrid.

It was founded by former members of Rebel Act Studios, who had developed Severance: Blade of Darkness in 2001.

Dave Cox, a producer at Konami, assisted MercurySteam during the Castlevania: Lords of Shadow trilogy.

[2] After MercurySteam pitched a remake of the 2002 game Metroid Fusion to Nintendo, the producer, Yoshio Sakamoto, hired them to create a remake of Metroid II instead.

[4] In December 2020, Nordisk Film, under their Nordisk Games division, purchased a 40% stake in the studio.