Blas Monaco (November 16, 1915 – February 10, 2000) was an American professional baseball player who had a long career (1935–1944; 1946–1949) in minor league baseball interrupted by two brief Major League trials almost nine years apart with the Cleveland Indians in 1937 and 1946. The native of San Antonio, Texas, an infielder, threw and batted right-handed.

Monaco was born November 16, 1915, in San Antonio, Texas. His father, Frank, was an immigrant from Italy who worked as a fireman for the city. His mother, Margarita (Garza) Monaco, was a native Texan with an Italian mother and Mexican father.

After his major-league debut with the Indians in 1937, Monaco got one start. It came August 22 in Chicago. He went hitless in a 3-2 win. In September his rights were loaned to Buffalo of the International League.

Over the winter in 1944, Monaco found work in the defense industry and when the season rolled around he chose to be voluntarily retired and continue his war effort in the work force. He was reinstated the following winter. In the spring of 1946, his hot hitting earned him a spot on the Opening Day roster of the Cleveland Indians. Teams had to cut down to 30 players by June 15. Monaco, a utilityman, never needed his gloves because he saw duty only as a pinch-hitter (0-for-6 with a walk) and pinch-runner (5 times, scoring twice). Cleveland sold him to Seattle in the PCL in late May to reach the 30-man limit.

(excerpted from FindAGrave.com, Baseball Almanac, BR Bullpen & Wikipedia)