Antonio Castillo or Tony Castillo may refer to:
Antonio José Castillo [cas-TEEL-lyo] (born March 1, 1963) is a former Major League Baseball left-handed relief pitcher who played for the Toronto Blue Jays (1988–89, 1993–96), Atlanta Braves (1989–91), New York Mets (1991) and Chicago White Sox (1996–98).
Castillo signed with the Toronto Blue Jays as an amateur free agent on February 16, 1983, and worked his way through the Blue Jays farm system before making his Major League Baseball debut with the club on August 14, 1988, where he pitched a scoreless inning out of the bullpen in a 6-0 loss to the Kansas City Royals. He earned his first career strikeout against Royals shortstop Kurt Stillwell. On September 3, Castillo earned his first career victory, pitching 2.1 innings, allowing no hits and walking two batters, while striking out one in a 7-4 win over the Texas Rangers. Castillo played in 14 games with Toronto, going 1-0 with a 3.00 ERA in 15 innings pitched.
Castillo began the 1989 season with the Blue Jays, however, he struggled with the team, going 1-1 with a 6.11 ERA in 17 games. He did earn his first career save on April 16 against the Kansas City Royals, pitching 4.2 innings of scoreless baseball out of the bullpen in a 15-8 win. On August 24, the Blue Jays traded Castillo and Francisco Cabrera to the Atlanta Braves for Jim Acker.
Anthony Castillo Beltran (born June 14, 1957 in San Jose, California) is a retired American professional baseball player, a former catcher who played in five Major League games for the San Diego Padres during the 1978 season. He threw and batted right-handed, stood 6 feet 4 inches (1.93 m) tall and weighed 190 pounds (86 kg).
Drafted in the third round from James Lick High School in San Jose by the Padres in the 1975 Major League Baseball Draft, Castillo was recalled from the Double-A Amarillo Gold Sox after the 1978 minor league season, Castillo started three games at catcher for the Padres among his five MLB games. On September 29, he started against the Los Angeles Dodgers at San Diego Jack Murphy Stadium and collected his only MLB hit, an RBI single off Burt Hooton, to score eventual Hall of Famer Dave Winfield. His one hit in eight at bats earned Castillo a .125 lifetime batting average.
Castillo returned to the minors for good in 1979 and played six seasons at the Triple-A level before retiring.