Krist Anthony Novoselic (; Croatian: Novoselić; born May 16, 1965) is an American musician and activist. Novoselic co-founded and played bass for the rock band Nirvana.

Novoselic and Kurt Cobain formed the band Nirvana in 1987 along with drummer Aaron Burckhard, whom they recruited. Through the late 1980s, Nirvana established themselves as part of the Seattle grunge scene. In 1989, the band released its debut album, Bleach. Nirvana released their second studio album Nevermind in 1991. The band achieved worldwide fame through the success of Nevermind and the lead track off the album, "Smells Like Teen Spirit". The band's third studio album, In Utero (1993), was also a major success. Nirvana abruptly ended in 1994 following the death of Kurt Cobain. Novoselic has been inducted into the Rock and Roll Hall of Fame as a member of Nirvana, and has also received a Grammy Lifetime Achievement Award as a member of the band.

After Nirvana disbanded, Novoselic formed Sweet 75 in 1995 and Eyes Adrift in 2002, releasing one album with each band. From 2006 to 2009, he played in the punk rock band Flipper, and in 2011 he contributed bass and accordion to the song "I Should Have Known" on the Foo Fighters' studio album Wasting Light. From 2017 to 2020, he played bass and accordion for the band Giants in the Trees.

Outside of music, Novoselic has been active politically. From 2007 through 2010, he wrote a weekly column on music and politics for the Seattle Weekly website. Novoselic has served on the board of the electoral reform organization FairVote and has served as its chair. In 2020, he became board chair of Zócalo Public Square. He joined the Forward Party in 2023 and became the party's leader in Washington after the resignation of Chris Vance. In 2024, he founded the Cascade Party of Washington.