Joe Torre.
Torre, playing for the Atlanta Braves, hit one off of Ryan in the 7th inning of the game between the Braves and Mets on September 11, 1966. It was the first home run given up by Ryan in his MLB career.
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Nolan Ryan allowed 321 home runs in his career, and gave up home runs to 215 different batters. Will Clark hit the most with 6 home runs. Mike Schmidt was second with 5.
The first MLB home run hit off of Nolan Ryan was by Joe Torre in the 7th inning of the game between the New York Mets and Atlanta Braves played September 11, 1966.
Dann Howitt of the Seattle Mariners on September 22, 1993. This was Ryan's final game in MLB as he blew out his elbow while pitching to the next batter.