Peter James Mikkelsen was an American relief pitcher in Major League Baseball who played from 1964 through 1972 for the New York Yankees (1964–65), Pittsburgh Pirates (1966–67), Chicago Cubs (1967–68), St. Louis Cardinals (1968) and Los Angeles Dodgers (1969–72). Mikkelsen batted and threw right-handed was listed as 6 feet 2 inches (1.88 m) tall and 210 pounds (95 kg). He was born in Staten Island, New York.