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- Robert Earl Keen (1989, 1995, 1997, 2000 with Lyle Lovett, 2001)
- Garrison Keillor & the Hopeful Gospel Quartet (1993)
- Toby Keith (2001)
- The Kendalls (1984)
- Mary Ann Kennedy (1986 with Emmylou Harris)
- Doug Kershaw (1979)
- Hal Ketchum (1992, 1994, 1998)
- Rilo Kiley (2005)
- The Killers (2005)
- Rock Killough (1980 edited out of broadcast)
- Killough & Eckley (1978)
- Kimbra (2012)
- B.B. King (1983, 1996, 2001 "Big Blues Extravaganza" classic encore)
- Pee Wee King (1984 "Legends")
- Shelley King (2008 with Carolyn Wonderland)
- Kings of Leon (2008)
- Kiwi (1977)
- K'naan (2010)
- Leo Kottke (1981, 1988, 1993)
- Alison Krauss & Union Station (1992, 1996, 2000, 2001 w/ Shawn Colvin, 2002, 2005)
- Kris Kristofferson (1982, 1997)
- Ben Kweller (2003)
Read more about this topic: List Of Austin City Limits Performers