John Bertrand "Jocko" Conlan (December 6, 1899 – April 16, 1989) was an American baseball umpire who worked in the National League (NL) from 1941 to 1965.

[2] Beginning his professional baseball career in 1920, Conlan spent 13 years as a minor league player.

He spent a season with the Toledo Mud Hens of the American Association and then returned to the International League with the Montreal Royals in 1931 and 1932.

[4] Conlan began his major league career in 1934 as a center fielder for the Chicago White Sox.

The following year Conlan made the transition from player to umpire complete, beginning in the minor leagues.

Conlan umpired in the National League from 1941 to 1965,[5] officiating in five World Series (1945, 1950, 1954, 1957 and 1961) and six All-Star Games (1943, 1947, 1950, 1953, 1958 and the first 1962 contest).

Striking an umpire is a serious offense, but Conlan "kicked him right back", a sequence that an alert photographer also captured and which was circulated for some time.

[7] Conlan's name was mentioned several times in a fictitious baseball game celebrated in the 1962 song "The Los Angeles Dodgers", recorded by Danny Kaye.

[3] Upon Conlan's retirement, NL president Warren Giles said, "I know of no one who has been more dedicated to his profession, more loyal to the game in which he has been such a big party, and I hate to see him hang up his spikes.