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. During his professional career, Irizar took two victories – a stage win at the 2010 Tour du Poitou-Charentes and the general classification at the 2011 Vuelta a Andalucía.

Following his retirement from riding in August 2019, Irizar has worked as a directeur sportif for both the men's and women's Lidl–Trek WorldTeams, and from 2024, works as the general manager for the Lidl–Trek Development Team.