Gediminas Bagdonas (born 26 December 1985) is a Lithuanian former professional road racing cyclist, who competed professionally between 2007 and 2019 for the Klaipeda–Splendid, Ulan, Team Piemonte, An Post–Sean Kelly and AG2R La Mondiale teams. He was named in the start list for the 2015 Vuelta a España. Following his retirement, Bagdonas now works as a directeur sportif for UCI Continental team Kaunas Cycling Team.

Since 2023 Bagdonas is one of the coaches of Lithuanian national track team.