The 2021 8 Hours of Portimão was an endurance sports car racing event held at the Algarve International Circuit, Algarve, Portugal, on 13 June 2021. It served as the second round of the 2021 FIA World Endurance Championship, and was the first running of the event as part of the championship. The race marked the debut of the Glickenhaus Racing car called the 007 LMH. The race was originally scheduled to be the opening round of the championship, replacing a race at Sebring International Raceway in Florida due to travel issues relating to the COVID-19 pandemic. The race was later postponed from the original date of 4 April due to quarantine regulations in Portugal, meaning it would no-longer be the opening round. The race was won by the Toyota GR010 Hybrid of Sebastien Buemi, Kazuki Nakajima