Pedro Orlando Castellano Arrieta (born March 11, 1970), is a Venezuelan former professional baseball third baseman/first baseman. He played in Major League Baseball (MLB) for the Colorado Rockies (1993, 1995–1996), in Nippon Professional Baseball (NPB) for the Yomiuri Giants (1997).
Castellano was a career .161 hitter (15-for-93) with three home runs, nine RBI, 13 runs, two doubles and one stolen base in 51 games. Castellano played for the Tecolotes de Nuevo Laredo of the Mexican League in 2010.