Robert Scot Shields (born July 22, 1975) is an American former professional baseball relief pitcher.

[1] He graduated from Fort Lauderdale High School and attended Lincoln Memorial University while majoring in kinesiology.

In 1999, he split his time as a starter and a reliever at High-A Lake Elsinore, gaining a 10-3 record with a 2.52 ERA and one save.

Though he started the 2001 season with the Triple-A Salt Lake Stingers, Shields was called up to MLB on May 25, making his debut against Tampa Bay Rays on May 26, pitching one-plus innings and allowing one hit and one walk.

In eight relief appearances with the Angels, Shields allowed eight hits and seven walks before being optioned back to Salt Lake, where he stayed for the remainder of the season.

He also started for the club on September 27 against the Seattle Mariners, receiving a no-decision and allowing four hits and two earned runs while striking out two.

He led the American League with 69.2 innings of relief before moving into the Angels' starting rotation to end the season in August.

In the post-season that year, he struggled in two appearances during the ALDS, pitching three innings and allowing two earned runs with a 6.00 ERA.

When Rodríguez replaced veteran Troy Percival as the Angels' closer in 2005, Shields emerged as the club's trusted setup man, pitching the eighth inning as the bridge to Francisco.

Shields represented the United States in the 2006 World Baseball Classic, the only member of the Angels to play for the USA squad.