In the video game industry, a console war describes the competition between two or more video game console manufacturers in trying to achieve better consumer sales through more advanced console technology, an improved selection of video games, and general marketing around their consoles. While console manufacturers are generally always trying to out-perform other manufacturers in sales, these console wars engage in more direct tactics to compare their offerings directly against their competitors or to disparage the competition in contrast to their own, and thus the marketing efforts have tended to escalate in back-and-forth pushes.

While there have been many console wars to date, the term became popular between Sega and Nintendo during the late 1980s and early 1990s as Sega attempted to break into the United States video game market with its Sega Genesis console. Through a novel marketing approach and improved hardware, Sega had been able to gain a majority of the video game console market by 1991, three years after the Genesis’ launch. This caused back and forth competition between the two companies throughout the early 1990s. However, Nintendo eventually regained its market share and Sega stopped making home console hardware by 2001.