Robert William Andrew Feller (November 3, 1918 – December 15, 2010), nicknamed "the Heater from Van Meter", "Bullet Bob", and "Rapid Robert", was an American baseball player who was a pitcher for 18 seasons in Major League Baseball (MLB) for the Cleveland Indians between 1936 and 1956. In a career spanning 570 games, Feller pitched 3,827 innings and posted a win–loss record of 266–162, with 279 complete games, 44 shutouts, and a 3.25 earned run average (ERA). His career 2,581 strikeouts were third all-time upon his retirement.

A prodigy who bypassed baseball's minor leagues, Feller made his debut with the Indians at the age of 17. His career was interrupted by four years of military service (1942–1945) as a United States Navy Chief Petty Officer aboard USS Alabama during World War II. Feller became the first pitcher to win 24 games in a season before the age of 21. He threw no-hitters in 1940, 1946, and 1951, and 12 one-hitters, both records at his retirement. He helped the Indians win a World Series title in 1948 and an American League-record 111 wins and the pennant in 1954. Feller led the American League in wins six times and in strikeouts seven times. In 1946 he recorded 348 strikeouts, the most since 1904 and then believed to be a record.

An eight-time All-Star, Feller was ranked 36th on Sporting News's 1999 list of the 100 Greatest Baseball Players and was named the publication's "greatest pitcher of his time". He was a finalist for the Major League Baseball All-Century Team in 1999. Baseball Hall of Fame member Ted Williams called Feller "the fastest and best pitcher I ever saw during my career." Hall of Famer Stan Musial believed he was "probably the greatest pitcher of our era." He was elected into the Baseball Hall of Fame in 1962 in his first year of eligibility, with the then fourth highest percentage of votes. He was elected the inaugural President of the Major League Baseball Players' Association and both organized and participated in barnstorm exhibition games which featured players from both the Major and Negro leagues. Feller died at the age of 92 in 2010.

Feller played primarily as a shortstop or outfielder, emulating Rogers Hornsby's batting stance. From the age of 15, he began to pitch for the Oakviews after a starting pitcher was injured; while doing so, Feller continued to play American Legion baseball. His catcher during this period was Nile Kinnick, who later won the Heisman Trophy in 1939 and became a member of the College Football Hall of Fame.

A student at Van Meter High School, Feller was a starting pitcher for the school's baseball team. During this time, he continued to play on the Farmers Union team in the American Amateur Baseball Congress, and had 19 wins and four losses for Farmers Union one season. He also was the starting center for the high school basketball team. By the age of 16, Feller possessed what critics judged a high quality fastball; major league scouts traveled to Dayton, Ohio to watch him in the annual national baseball tournament. After the game, several big league clubs offered signing bonuses with their contract offers, but he had already been signed to a professional contract with the Cleveland Indians.

In 1936, Feller was signed by Cy Slapnicka, a scout for the Indians, for one dollar and an autographed baseball. While scouting Feller, Slapnicka said, "This was a kid pitcher I had to get. I knew he was something special. His fastball was fast and fuzzy; it didn't go in a straight line; it would wiggle and shoot around. I didn't know then that he was smart and had the heart of a lion, but I knew that I was looking at an arm the likes of which you see only once in a lifetime." Feller was assigned to the Fargo-Moorhead Twins and was to report there after finishing the high school semester.

Slapnicka was later named general manager of the Indians and transferred Feller's contract from Fargo-Moorhead to the New Orleans Pelicans. He was planning to add Feller, along with outfielder Tommy Henrich, to the major league roster after a few exhibition and semi-pro games, without either playing for a farm club. By doing so, the Indians would be in violation of Major League Baseball's rule stating that, at the time, only minor league teams could sign amateur baseball players to contracts.

After a three-month investigation, concluding in December 1936, about whether the Indians broke any Major League Baseball rules by signing Feller, Commissioner Kenesaw Mountain Landis disagreed with the argument presented by Slapnicka and Indians president Alva Bradley, but awarded both Feller and Henrich free agency and required the club to pay a $7,500 fine, equivalent to $170,000 in 2024. Landis made the decision partly due to the testimony of Feller and his father, who wanted his son to play for Cleveland and who had also told Landis he would take the issue to court. Feller elected to remain with the Indians but Henrich joined the New York Yankees. Sports columnist Joe Williams wrote, "For $7500 the Cleveland Indians received $500,000 [equivalent to $11,300,000 in 2024] worth of publicity. ... I feel pretty sure Mr. Alva Bradley, president of the Indians, will admit this is the cheapest investment he ever made in publicity."