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In a single season, James Harden and Russell Westbrook have had the most turnovers in basketball. James Harden had 374 turnovers in 2015 and 387 turnovers in 2018, while Russell Westbrook had 381 turnovers in 2017 and 438 turnovers in the 2016-2017 season. However, James Harden holds the record with 464 turnovers in the 2016-2017 season. We got the top five most turnovers in a single season. Starting off at number five, we have James Harden in 2015 with 374. At number four, we have Russell Westbrook in 2017 with 381. At number three, we have James Harden as well in 2018 with 387. At number two, we have Russell Westbrook in the 2016 to 17 season with 438. And at number one, we have James Harden again with the 2016 to 17 season with 464 turnovers in a season.