Patrick Michael Pacillo (born July 23, 1963 in Jersey City, NJ) is an American former professional baseball player. Pat pitched for the Cincinnati Reds of the Major League Baseball (MLB) in 1987 and 1988.

Pacillo grew up in Rutherford, New Jersey and played both baseball and football at Rutherford High School. In 1982 and 1983, he played collegiate summer baseball for the Harwich Mariners of the Cape Cod Baseball League (CCBL). He played outfielder and pitcher, batting .338 in 1983 and leading Harwich to the league title. Pacillo was inducted into the CCBL Hall of Fame in 2005.

He was drafted by the Cincinnati Reds in the 1st round (5th pick) of the 1984 MLB draft out of Seton Hall University, where he had played baseball for the Pirates under head coach Mike Sheppard. On May 23, 1987, Pat made his MLB debut, in which he pitched 5 innings and gave up 2 earned runs while striking out 3.

In 1988, Pacillo was traded to the Montreal Expos along with Tracy Jones for Randy St. Claire, Jeff Reed, and Herm Winningham. He never pitched in the majors again, and didn't live up to expectations as a high draft pick.

Pat is perhaps best remembered for replacing Pete Rose on the Reds' 40-man roster following the 1986 season. Rose, who by that point was serving as the team's player-manager, removed himself from the roster in order to make room for Pacillo. "We didn't want to lose the best prospect in the organization," Reds GM Bill Bergesch told UPI in November 1986. "We just didn't want to take a chance with him."

During the 1984 Summer Olympics, Pat played baseball for the United States team. Notable teammates included Will Clark, Barry Larkin, Mark McGwire, B. J. Surhoff, Bill Swift, and Bobby Witt. The US team lost in the final to Japan. After baseball, Pat, A resident of Bradley Beach, New Jersey, has worked as a financial adviser.

(excerpted from The Greatest 21 Days, Baseball Almanac, BR Bullpen & Wikipedia)