The 2021 Tour of Slovenia (Slovene: Dirka po Sloveniji) was the 27th edition of the Tour of Slovenia stage race that was held from 9 to 13 June 2021. The 2.Pro-category race was initially scheduled to be a part of the inaugural edition of the UCI ProSeries, but after the 2020 edition was cancelled due to the COVID-19 pandemic, it made its UCI ProSeries debut in 2021, while also still being a part of the 2021 UCI Europe Tour. This was second time Tour of Slovenia was participated by Tour de France winner, 2011 by Carlos Sastre and in 2021 by Tadej Pogačar.

The race was won for the first time by Tadej Pogačar of UAE Team Emirates. Pogačar first took the lead when he attacked on the climb of Svetina, the penultimate climb on stage 2. He proceeded to extend his lead to more than a minute on the way to the finish in Celje. He successfully defended his lead on the final three stages, including finishing second to his teammate, Diego Ulissi, on the queen stage to Nova Gorica. Total sum of prizes was 64,766 €.

Four UCI WorldTeams, eight UCI ProTeams, seven UCI Continental teams, and the Slovenian national team made up the twenty teams that participated in the race. Astana–Premier Tech, with six riders, was the only team to not field a full squad of seven riders. Of the 139 riders to start the race, 117 finished.

UCI WorldTeams

UCI ProTeams

UCI Continental Teams

National Teams