Markel Irizar Aranburu (born 5 February 1980) is a Spanish former professional road racing cyclist, who rode professionally between 2004 and 2019 for the Euskaltel–Euskadi, Team RadioShack and Trek–Segafredo teams.Born in Oñati, Basque Country, Irizar currently resides in Arrasate, Basque Country, Spain.
Irizar was diagnosed and treated for testicular cancer in 2002.In February 2019, Irizar announced his plans to retire from the peloton after the 2019 Clásica de San Sebastián, in early August.