Robert Scot Shields (born July 22, 1975 in Fort Lauderdale, Florida) is a Major League Baseball relief pitcher with the Los Angeles Angels of Anaheim, with whom he has spent his entire career, serving as their setup man since 2005. He is currently the longest-tenured Angel, having played with them since 2001.

He graduated from Fort Lauderdale High School and attended Lincoln Memorial University while majoring in kinesiology. He was drafted by the then-Anaheim Angels in the 38th round (1137th overall) of the 1997 Major League Baseball Draft.

He began his career as a reliever in 1997 with Low-A Boise, earning a 7-2 record with two saves and a 2.94 ERA. The next year, he moved to Single-A Cedar Rapids, compiling a 6-5 record, seven saves and a 3.65 ERA. 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. In nine starts, he pitched two complete games and one shutout. For his efforts that year, he was named Angels Minor League Pitcher of the Year. He was promoted to Triple-A Edmonton in 2000, where he struggled with a 7-13 record and a 5.41 ERA.