Per Jonas Wiberg (born 8 June 1968) is a Swedish musician who has been a member of the bands Spiritual Beggars (1998-) as a keyboardist, King Hobo (2007-) as a keyboardist, guitarist, and vocalist, and Kamchatka (2015-) as a bassist and vocalist, his solo band, Per Wiberg (2019-), and Switchblade (2020-) as a Bassist. Wiberg was formerly in the bands, Death Organ (1993-1997) as an Organist, Boom Club (1994) as a Vocalist, and Opeth (2003-2011) as a Keyboardist / Backing vocalist.

Before joining Spiritual Beggars, Wiberg was a member of Death Organ, a band based in Borlänge. He has also fronted the band Boom Club, of the same area.

Wiberg toured with Opeth from the 2003 Deliverance/Damnation tour onward, and joined Opeth officially in 2005. Wiberg provided backing vocals for Opeth in addition to his keyboard duties. It was announced on 6 April 2011 that Wiberg was leaving Opeth as part of a mutual decision between him and the other band members.

Wiberg played the keyboard in the intro to "Enemy Within" by the melodic death metal band Arch Enemy. He has also played piano on Swedish progressive rock band Anekdoten's 1993 release Vemod.

In 2007, Wiberg collaborated on a project called King Hobo with Clutch drummer Jean-Paul Gaster and Kamchatka guitarist Thomas Andersson.

Since 2012 he has been a live musician for the Swedish doom metal band Candlemass as well as joining Swedish band Switchblade on selected dates as a keyboard player. He also played bass when needed.

Wiberg has collaborated on all Big Scenic Nowhere releases since 2019, including two studio albums and two EPs.