As coach David Michael Trembley (born October 31, 1951) is an American professional baseball executive who served as the director of player development of the Atlanta Braves in 2015.

Trembley has worked for the Baltimore Orioles, Chicago Cubs, Pittsburgh Pirates, San Diego Padres and Atlanta Braves.

Trembley left the Cubs organization to embark on his managing career with the unaffiliated Kinston Eagles franchise of the Class A Carolina League in 1986.

[2] He joined the Pirates organization in 1987, and skippered their AA Harrisburg Senators of the Eastern League for three seasons, capturing an EL title and being named the loop's Manager of the Year.

In 1990 he served as Director of the day-to-day operation of Pittsburgh's minor league complex and spring training facility at Bradenton, Florida.

Trembley was hired by the San Diego Padres in 1991 and managed their Class A South Atlantic League affiliate Charleston (SC) Rainbows in 1991 and 1992.

[4] Taking over a ballclub that had ended its previous three seasons in or below fifth place in the Eastern League's Southern Division, he led the Baysox to fourth at 69–72 in 2003.

[10] He inherited a 29–40 ballclub that was mired in last place in the American League (AL) East and in the midst of an eight-game losing streak.

[11] Later that same night, the Orioles began a nine-game losing streak by surrendering the most runs ever in an AL contest in a 30–3 defeat to the Texas Rangers in the first game of a twi-night doubleheader at Camden Yards.

[15] His contract was similarly extended again a year later on October 2, 2009, despite another last-place finish, a worse record and a 24–50 performance after the All-Star break.

[18] With the Orioles still stuck in last place in the AL East with a major-league-worst 15–39 record and an eight-game losing streak, Trembley was fired on June 4, 2010 and replaced by third-base coach Juan Samuel.

Trembley was relieved of his duties as the Houston Astros bench coach on September 1, 2014,[22][23] and rejoined the Braves as director of player development/Field Coordinator in October 2014.