Pentti Aatos Kahma (born December 3, 1943 in Alavieska) is a retired discus thrower from Finland, who is best known for winning the title at the 1974 European Championships in Rome, Italy. He represented his native country at the 1976 Summer Olympics in Montreal, Canada. The 11th European Athletics Championships was held from 2 September to 8 September 1974 in the Stadio Olimpico of Rome, the capital of Italy.