Barrett Astin (born October 22, 1991) is an American former professional baseball pitcher.

After signing, Astin made his professional debut with the Helena Brewers and spent the whole season there, going 1–1 with a 4.30 ERA in 37+2⁄3 innings pitched.

In 2014, he played for the Wisconsin Timber Rattlers where he compiled an 8–7 record and 4.96 ERA in 27 games (18 starts).

[4] In 2015, he pitched with the Daytona Tortugas and Pensacola Blue Wahoos where he pitched to an 8–9 record with a 3.98 ERA and 1.35 WHIP in 30 games (25 starts), and in 2016, he played for Pensacola where he was 9–3 with a 2.26 ERA and a 0.96 WHIP in 37 games (11 starts).

On May 22, 2018, Astin signed with the Kansas City T-Bones of the independent American Association.