Dyar K Miller (born May 29, 1946) is a retired professional baseball pitcher, coach and instructor. A product of Utah State, Miller pitched 13 seasons in the Major Leagues between 1968 and 1984. He also pitched all or parts of seven seasons in Major League Baseball (MLB) from 1975 to 1981 for the Baltimore Orioles, California Angels, Toronto Blue Jays, and the New York Mets. After his playing career, Miller coached and instructed for 28 seasons (19 in the St. Louis Cardinals organization), mainly in the minor leagues. Most recently, he served as the Cardinals' bullpen coach in 2012.

Miller graduated from Utah State University with a bachelor of science in history.

After graduating from Utah State, Miller availed himself for the MLB draft, but was not chosen. He signed with the Philadelphia Phillies as a catcher and was assigned to the Huron Phillies, where Dallas Green was the manager. However, after two errors and four games, the Phillies released him. Miller decided to pursue pitching instead, and in 1969, the Orioles signed him. Between the Florida Instructional League Orioles (a Rookie League team) and the (a Class-A California League team), MiIller appeared in 36 games, making 13 starts and compiling 153 innings pitched (IP) with a 2.47 earned run average (ERA).

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