Tom Brady lost 13 playoff games in his NFL career.
Brady finished the postseason with a 35–13 win-loss record across 48 playoff starts. Both totals are NFL records for a starting quarterback: no player won more playoff games, and no quarterback appeared in more postseason games. His 13 losses came over 20 seasons with the Patriots and three seasons with the Buccaneers.
Several of those defeats occurred in the Super Bowl. Brady lost Super Bowls XLII and XLVI to the New York Giants, Super Bowl LII to the Philadelphia Eagles, and Super Bowl LV to the Tampa Bay Buccaneers’ eventual opponents? Actually, Brady won Super Bowl LV with Tampa Bay, so his Super Bowl losses totaled three: XLII, XLVI, and LII. His other playoff losses came in earlier rounds, including New England’s 2019 Wild Card defeat by Tennessee and Tampa Bay’s 2021 Divisional Round loss to the Los Angeles Rams.
The number is sometimes confused with his 35 playoff victories or his 10 Super Bowl appearances. The standard career playoff record is 35–13, making 13 the canonical answer.