After his resurgent season in Cleveland, Kazmir signed a two-year, $22 million contract with the Oakland Athletics on December 3, 2013. Kazmir pitched 190 innings for the A's in 2014, the second highest total of his career, and finished the season with a 3.55 ERA and a 15 wins, a career high. Although his strikeouts per 9 innings rate dropped sharply from the previous season (9.2 to 7.8), Kazmir posted a career best walks/hits per 9 inning rate (1.161) and was named to the 2014 AL All-Star team, his third appearance in the game and first since 2008. He was less effective in the second half, and his ERA rose over a full run from the All-Star break until the end of the season.