Donald William Aase (/ˈɑːsiː/ AH-see; born September 8, 1954) is an American former professional baseball pitcher who played in Major League Baseball from 1977 to 1990. During his MLB career, Aase played with the Boston Red Sox (1977), California Angels (1978–84) and Baltimore Orioles (1985–88), of the American League. In the National League, he played for the New York Mets (1989) and Los Angeles Dodgers (1990).