Tyler Alan O'Neill (born June 22, 1995) is a Canadian professional baseball left fielder for the St. Louis Cardinals of Major League Baseball (MLB). He made his MLB debut on April 19, 2018. He has represented Canada in international play, winning a gold medal at the 2015 Pan American games. O'Neill stands 5 feet 11 inches (1.80 m) tall, weighs 210 pounds (95 kg), and throws and bats right-handed.
From the Greater Vancouver area of British Columbia, the Seattle Mariners selected O'Neill in the third round of the 2013 MLB draft. In 2016, he was the Southern League Most Valuable Player (MVP) along with winning the Southern League championship with the Jackson Generals. On July 21, 2017, the Mariners traded him to the Cardinals. Later that year, he won the Pacific Coast League championship as a member of the Memphis Redbirds. After making his MLB debut in 2018 with the Cardinals, O'Neill struggled with injuries and split time between St. Louis and the minor leagues for two seasons before he became their starting left fielder in 2020, winning his first ever Gold Glove Award.
O'Neill attended Garibaldi Secondary School in Maple Ridge, British Columbia and played for the Langley Blaze of the British Columbia Premier Baseball League. He grew up a fan of the Seattle Mariners. He committed to play college baseball at Oregon State University for the Oregon State Beavers.

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