Sean Patrick Nolin (born December 26, 1989) is an American professional baseball pitcher who is a free agent.

He has previously played in Major League Baseball (MLB) for the Toronto Blue Jays, Oakland Athletics,Washington Nationals, and Miami Marlins.

He has also played in Nippon Professional Baseball (NPB) for the Saitama Seibu Lions and in the KBO League for the Kia Tigers.

[4] Nolin split the 2012 season between the Dunedin Blue Jays and the New Hampshire Fisher Cats, finishing at 10–0 with a 2.04 ERA.

[5] Nolin missed the first month of the 2013 baseball season with a groin injury suffered during spring training.

[15] On November 28, 2014, Nolin was traded to the Oakland Athletics, along with Brett Lawrie, Kendall Graveman, and Franklin Barreto, for Josh Donaldson.

[21] On August 21, Nolin underwent Tommy John surgery, and was put on the injured list for the rest of the 2016 season plus all of 2017.

Nolin did not make an appearance on the year as he recovered from surgery, and elected free agency on November 6, 2017.

[27] On December 6, 2019, Nolin signed with the Saitama Seibu Lions of Nippon Professional Baseball (NPB).

[32] On September 9, Nolin intentionally threw at Atlanta Braves' first baseman Freddie Freeman, and was issued a 5-game suspension, in which he did not appeal.

[35] Nolin made 21 starts for Kia, posting an 8–8 record and 2.47 ERA with 108 strikeouts in 124.0 innings pitched.

[38] He pitched three innings of mop up relief against the Atlanta Braves that night, surrendering 6 earned runs on 7 hits and 2 walks.