American ice hockey player Marshall Grahlfs Peabody of the New York Athletic Club of the American Amateur Hockey League.

Marshall Peabody was born in New York City on November 8, 1882. He debuted with the white and red shirted New York Athletic Club in the 1904–05 AmAHL season, playing in one game and tallying one goal from his left wing position. He then went on to play with the club until the 1911–12 season, winning two consecutive league championships in 1909 & 1910.

In 1912–13 and 1913–14, as well as in the 1916–17 season, Peabody played with the St. Nicholas Hockey Club in the AmAHL, winning a league championship in 1913–14.

Marshall Peabody served as a Second Lieutenant with the United States Army in World War I and died near Moulin-de-Charlevaux in the Forest of Argonne, France on October 5, 1918. He was 35 years old.