Mark Alan Ibold (born October 17, 1962) is an American bass guitarist who was a member of the indie band Pavement from 1992 to 1999, and again for their 2010 reunion. He was also in the alternative rock band Sonic Youth from 2006 until their 2011 breakup, mainly on bass but occasionally playing guitar. He is based in New York.
In addition to playing bass in Pavement, Ibold did some back-up vocals, most notably on the track "Carrot Rope" from the album Terror Twilight. Prior to joining Pavement, he was a member of the Dustdevils in the late 1980s and early 1990s.
While a member of Pavement, Ibold joined Free Kitten along with Sonic Youth's Kim Gordon, Pussy Galore's Julie Cafritz and Boredoms' Yoshimi P-We.
In 2006, Ibold joined Sonic Youth on their Rather Ripped tour, and he also appeared with the band on their first encores during the 2007 "Don't Look Back" shows. As of their 2009 album The Eternal, he was a full participating member of the band until they split up in 2011.