Adhemar Grijó Filho (18 October 1931 – 23 August 2020) was a Brazilian athlete who competed in three Olympics.

[1] At the inaugural Pan American Games in 1951, in Buenos Aires, Argentina, he finished 6th in the 200-metre breaststroke.

[1] At the 1955 Pan American Games in Mexico City, he won the bronze medal in the Water Polo.

[1][3][4] At the 1959 Pan American Games in Chicago, he won the bronze medal in the Water Polo.

[1][5][6] At the 1963 Pan American Games in São Paulo, he won the gold medal in the Water Polo.