The Nemesis, also called the Nemesis-T Type, the Pursuer or the Chaser (追跡者, Tsuisekisha), is a character in Resident Evil (Biohazard in Japan), a survival horror video game series created by Japanese company Capcom. Although smaller than other Tyrant models, the creature dwarfs a typical human, and possesses vastly superior intelligence and physical dexterity to its undead peers. It is featured in Resident Evil 3: Nemesis (1999) as a titular main villain before later emerging in other titles and cameo roles. It is also featured on various merchandise and was portrayed by Matthew G. Taylor in the 2004 film Resident Evil: Apocalypse. The character is voiced by Tony Rosato in the original game and Gregg Berger in Operation Raccoon City (2012). In the 2020 remake of Resident Evil 3, the character is voiced by David Cockman, with Neil Newbon providing the motion capture performance. Nemesis has also been featured in several other game franchises, including as a playable character in Marvel vs. Capcom and Dead by Daylight.

Since the Nemesis' introduction, the character has received a positive reception and has come to be regarded as one of the series' most popular characters, though his design and role in the Resident Evil 3 remake has been criticized. Some publications have praised its role as an intimidating villain, while others have noted it as one of their favorite and most terrifying monsters in video games.