Andreas Rikardsen Leknessund (born 21 May 1999 in Tromsø) is a Norwegian cyclist, who currently rides for UCI ProTeam Uno-X Mobility.

Leknessund turned professional in May 2018 with UCI Continental team Uno-X Norwegian Development Team. His first major victory was the Norwegian elite national time trial championships in 2019. He stayed with the team until being signed by UCI WorldTeam Team DSM in 2021 after showing promising results, having won the elite national time trial championships a second time, the Giro del Friuli Venezia Giulia and the UEC European Under-23 Time Trial Championships among other races in 2020. In June 2022 he won stage two of the Tour de Suisse in a solo victory from the breakaway. In August, he won the Arctic Race of Norway, taking the race lead after winning the fourth and final stage. At the 2023 Giro d'Italia, Leknessund moved into the lead after finishing second on stage four. He was able to hold onto the lead until the time trial on stage nine. He ultimately went on to finish 8th overall. This also made him the first rider from north of the Arctic Circle to have led the race.

After spending three seasons with Team dsm–firmenich, Leknessund returned to Uno-X Mobility for the 2024 season on a three-year contract.