Philip Mason Garner (born April 30, 1949) is an American former professional baseball player and manager. He played in Major League Baseball (MLB) as an infielder with the Oakland Athletics, Pittsburgh Pirates, Houston Astros, Los Angeles Dodgers and San Francisco Giants from 1973 to 1988. With the Pirates, he won the 1979 World Series over the Baltimore Orioles. He was manager of the Astros from July 14, 2004 to August 27, 2007, leading Houston to a World Series appearance in 2005.

Garner was born on April 30, 1949, in Jefferson City, Tennessee, and grew up in Rutledge, Tennessee. After a year of high school in Rutledge, which did not have a football team, Garner's father moved the family to Knoxville so Garner could attend Bearden High School which had an athletic program with both football and baseball. Garner played football and baseball, and going to Bearden gave him an opportunity to play both sports, increasing his chance of obtaining an athletic scholarship to college which would otherwise be unaffordable for the family. He was Bearden's starting quarterback in 1965-66.

Bearden's baseball facility is now named Phil Garner Ballpark, and the school dedicated a bronze bust of Garner in front of the facility in 2003.

He attended the University of Tennessee on a baseball scholarship, playing second and third base on the baseball team from 1968-70. In 1969, he led the National Collegiate Athletic Association (NCAA) in home runs (12), and twice led his team in runs batted in (RBI). He was selected All-Southeastern Conference twice, and was named an All-American in 1970. Two years after being drafted into professional baseball, in 1973, Garner graduated with a Business Administration degree.

In 2002, he was inducted into the Tennessee Sports Hall of Fame. In 2009, the University of Tennessee retired his number 18.

Garner was originally drafted out of Tennessee by the Montreal Expos in the eighth round of the 1970 Major League Baseball draft, but did not sign. Seven months later, he was the second overall pick by the Oakland Athletics in the secondary January 1971 draft. Garner was in the A's minor league system from 1971 to 1974, playing almost all of his games as a third baseman.

In 1973, he played for the Tucson Toros of the Triple-A Pacific Coast League, with a .289 batting average, 14 home runs, 73 RBI and 87 runs scored. He came up to the A's for nine games at the end of the year, but was back at Tucson for the majority of the following year in 1974. He was even better at Tucson in 1974, batting .330, but again played sparsely when called up to the A's later in the year. The A's won two World Series in 1973 and 1974, but Garner was not on the World Series roster either year. Garner's problem was the A's had an All-Star third baseman in Sal Bando, and there was no place for Garner to play.

During spring training in 1975, the A's released second baseman Dick Green, and converted Garner into a second baseman. He started 159 games at second base for the A's in 1975, and had a .968 fielding percentage. This was the first time since 1972, however, that the A's did not win the World Series. Among other things, the A's lost future Hall of Fame pitcher Catfish Hunter to the New York Yankees in one of the earliest free agency signings in modern baseball. On June 27, 1975, he got the A's 10,000th hit against the Angels, on a double off Andy Hassler in Anaheim. Garner had a breakout year for Oakland in 1976 in which he hit 8 home runs and had 74 RBI's. He was named an All-Star that year, the first of his career. He stole a career high 35 bases that year.