Milton Steven Pappas (May 11, 1939 – April 19, 2016) was an American professional baseball player. He played in Major League Baseball as a right-handed pitcher from 1957 through 1973. Nicknamed "Gimpy", the 17-year veteran pitched for the Baltimore Orioles (1957–1965), Cincinnati Reds (1966–1968), Atlanta Braves (1968–1970) and Chicago Cubs (1970–1973). A control specialist, Pappas pitched in 520 games, starting 465, with 209 wins, 164 losses, 43 shutouts, 1,728 strikeouts and a 3.40 ERA in 3,186 innings pitched. He was a three-time All-Star player for the Orioles and was inducted into the Baltimore Orioles Hall of Fame in 1985. He was also a member of the 1960s Baltimore Orioles Kiddie Korps.

Pappas was born in Detroit, Michigan, to Greek parents, and his birth name was Miltiades Stergios Papastergios. In 1957, as a senior at Cooley High School, Pappas was scouted by several teams and signed with the Orioles at the suggestion of Hal Newhouser, a former star pitcher for the Detroit Tigers who lived in the Detroit area. Pappas signed for $4,000 and pitched only three games in the minor leagues before being called up in August. He made his Major League debut on August 10 in relief against the New York Yankees. In 1958 he made the Orioles’ starting rotation and began a streak of 11 consecutive double-digit win seasons with a 10–10 record.

Pappas soon became the ace of the Orioles' staff, and was named an All-Star in 1962, pitching in both All-Star games (from 1959 to 1962, Major League Baseball had two All-Star games). He was also named starting pitcher in the 1965 All-Star Game. In each year from 1959 through 1965, Pappas never had a losing record, winning between 13 and 16 games.

In 1998, as Mark McGwire and Sammy Sosa surpassed Roger Maris’s single-season home run record, Pappas admitted that he threw nothing but fastballs to Maris in giving up Roger's 59th home run in 1961. Pappas explained that he was upset that commissioner Ford Frick was planning to list separately the new home run mark if Maris did not eclipse Babe Ruth's 60 home runs in 1927 on or before the Yankees’ 154th game.

In December 1965, Pappas and another pitcher, Jack Baldschun, and outfielder Dick Simpson were traded to the Cincinnati Reds for superstar and future Baseball Hall of Famer Frank Robinson. Reds president Bill DeWitt believed that Robinson was "not a young 30." The outrage from the Cincinnati fans over the deal made it difficult for Pappas to adjust to pitching in Cincinnati. He posted a winning record in 1966 (12–11), but with a 4.29 ERA — more than a run above his career ERA to that point.

In 1967 Pappas won a team- and career-high 16 games, but when he got off to a slow start in 1968, he was dealt along with Bob Johnson and Ted Davidson by the Reds to the Atlanta Braves for Tony Cloninger, Clay Carroll and Woody Woodward on June 11, 1968.

Pappas went 10–8 for the Braves with a 2.37 ERA. In 1969 injuries sidelined him for much of the first four months of the season, and he won only six games with 10 losses with a 3.62 ERA. Yet Atlanta won the National League West title (both leagues were now split into two divisions after expanding from 10 teams to 12) for the franchise's first postseason berth since the 1958 World Series as the Milwaukee Braves, and Pappas finally achieved his goal of the post-season. In the playoffs against the New York Mets, Pappas made his only post-season appearance, allowing three runs in three innings in relief.

In 1970, the Braves pulled Pappas from their rotation after only three starts after he compiled a 6.06 ERA and allowed six home runs. On June 23, they sold his contract to the Chicago Cubs, where he got another chance to prove he was still a major league starter. Pappas posted a 7–2 record with a 2.36 ERA at home and a 10–8 record with a 2.68 ERA overall.