Arnold Mario Portocarrero (July 5, 1931 – June 21, 1986) was an American professional baseball player and right-handed pitcher who appeared in 166 games pitched in the major leagues over all or parts of seven seasons for the Philadelphia / Kansas City Athletics and Baltimore Orioles. Born in New York City of Puerto Rican descent, he was listed as 6 feet 3 inches (1.91 m) tall and 196 pounds (89 kg).