David Alan Robertson (born April 9, 1985), nicknamed "D-Rob", is an American professional baseball pitcher who is a free agent. He has previously played in MLB for the New York Yankees, Philadelphia Phillies, Chicago White Sox, Tampa Bay Rays, Chicago Cubs, New York Mets, Miami Marlins, and Texas Rangers.

Robertson played college baseball for the Alabama Crimson Tide. He was drafted by the Yankees in the 17th round of the 2006 MLB draft and made his MLB debut with the Yankees in 2008. Robertson was a member of the Yankees team that won the 2009 World Series. He was named an MLB All-Star in 2011. After Mariano Rivera retired, Robertson served as the Yankees' closer in 2014. He signed with the White Sox as a free agent after the 2014 season and was traded back to the Yankees in July 2017. Robertson signed with the Phillies as a free agent after the 2018 season.

Robertson was born in Birmingham, Alabama, and played his first three years of high school baseball at Central-Tuscaloosa High School in Tuscaloosa, Alabama. He was a two-year starter for the Falcons at shortstop and pitcher. He helped lead his team to back-to-back area titles, as well as back-to-back 6A State Playoff appearances. After his junior year, Central High School was split into three smaller high schools, and Robertson attended Paul W. Bryant High School in Tuscaloosa, graduating in 2004. He led the Stampede to an area title and the Class 6A State Playoffs in the school's first year of existence.

Robertson enrolled at the University of Alabama and played college baseball for the Alabama Crimson Tide. As a freshman in 2005, Robertson appeared in a team-high 32 games with three games started. He compiled a 7–5 win–loss record with eight saves and a 2.92 earned run average (ERA), and set the single-season rookie record for most strikeouts (105). He led the Southeastern Conference (SEC) by limiting hitters to a .183 batting average. He was named Freshman All-SEC and Freshman All-American by Baseball America, Louisville Slugger Freshman All-American, and Collegiate Baseball Magazine Freshman All-American.

In his sophomore season, Robertson helped lead the Crimson Tide to their 25th SEC Championship. He appeared in 29 games, compiling a 4–4 record with a 3.02 ERA. He led the SEC with 10 saves. In 2006, he played collegiate summer baseball in the Cape Cod Baseball League for the Yarmouth-Dennis Red Sox and was named the most valuable player of the playoffs in Yarmouth-Dennis' championship season.

Due to Robertson being 21 at the time of the 2006 MLB draft, he was a draft-eligible sophomore and the New York Yankees selected him in the 17th round. He signed with the Yankees for a $200,000 signing bonus.

In 2007, pitching for the Charleston RiverDogs of the Single-A South Atlantic League, the Tampa Yankees of the High-A Florida State League, and the Trenton Thunder of the Double-A Eastern League, he was a combined 8–3 with four saves and an 0.96 ERA in 84+1⁄3 innings, allowing 45 hits while striking out 114 batters, averaging 12.1 strikeouts per nine innings. Robertson was a 2007 mid-season South Atlantic League All Star. He was third among minor league relievers, with a .154 opponents batting average.

In 2008, pitching for Trenton and the Scranton/Wilkes-Barre Yankees of the Triple-A International League, he was 4–0 with three saves and a 1.68 ERA in 53+2⁄3 innings, allowing 28 hits while striking out 77, averaging 12.9 strikeouts per nine innings. He was named the International League's "Best Reliever" of 2008 in Baseball America's Best Tools survey. Pitching for Scranton/Wilkes-Barre in 2009, he was 0–3 with two saves and a 1.84 ERA with 25 strikeouts in 14+2⁄3 innings, averaging 15.3 strikeouts per nine innings. In 2012 he pitched two scoreless innings for Scranton/Wilkes-Barre.