Seth Daniel Rosin (born November 2, 1988) is an American former Major League Baseball (MLB) pitcher who played for the Texas Rangers and Philadelphia Phillies in 2014 and 2015.

After graduating high school, the Minnesota Twins selected Rosin in the 28th round of the 2007 MLB Draft.

The Giants traded Rosin, Nate Schierholtz, and Tommy Joseph to the Philadelphia Phillies in exchange for Hunter Pence on July 31, 2012.

[9] He cleared waivers and was returned to the Phillies, who assigned him to the Lehigh Valley IronPigs of the Triple–A International League.

On April 20, 2017, Rosin signed with the St. Paul Saints of the American Association of Independent Professional Baseball.