Sajjad Ganjzadeh (, also Romanized as "Sajjād Ganjzādeh"; born 4 January 1992 in Tehran) is an Iranian karateka. Competing in the above 84 kg kumite division he won gold medals at the 2020 Tokyo Olympics, 2014 and 2016 world championships, 2013 and 2017 Asian championships, and 2018 Asian Games. He has also won multiple awards in competitions within the Karate1 Premier League.
He is the first Iranian karateka to win an Olympic gold medal. He won the gold medal in the men's +75 kg event after being knocked out by an illegal kick from Tareg Hamedi of Saudi Arabia. Hamedi was disqualified and Ganjzadeh won the gold medal.
In 2023, he won one of the bronze medals in his event at the Asian Karate Championships held in Malacca, Malaysia. He won the gold medal in the men's kumite +84kg event at the 2022 Asian Games held in Hangzhou, China.