Ultrasoft spol. s r.o. was a computer game developer and computer game publisher located in Bratislava, Slovakia. The company was founded by Louis Wittek in 1990, and dissolved in 2008.
Ultrasoft specialised in the development and publishing of games for the ZX Spectrum home computer. With over 40 titles to its credit, Ultrasoft was the biggest game software publisher in Czechoslovakia and, arguably, one of the biggest European producers of computer games during the 1990s. The company also acted as an exclusive distributor within the territory of Czechoslovakia for Domark Software and Ocean Software game software houses based in England.
Between 1991–1994 Ultrasoft also published a specialised monthly magazine Bit, aimed at owners of home computers and dealing with computer games in particular.