Roberto Antonio Petagine Hernandez (/pɛtəˈɡɪneɪ/; born June 7, 1971) is a Venezuelan former professional baseball player of Italian descent.

His Major League Baseball career includes brief stints with the Houston Astros (1994), San Diego Padres (1995), New York Mets (1996 and 1997), Cincinnati Reds (1998), Boston Red Sox (2005), and Seattle Mariners (2006); but he is best known for his success in the Japanese Central League between 1999 and 2004 where, as a member of the Yakult Swallows (1999–2002) and Yomiuri Giants (2003–2004), he was among Nippon Professional Baseball's premier offensive players.

A solid contact hitter who used the whole field with occasional pull power, the young Petagine was indeed most noteworthy for his control of the strike zone, and more specifically for the exceptional rate at which he drew walks.

The Giants acquired him to take the place of Hideki Matsui, who had signed with the New York Yankees to play in Major League Baseball.

In August, first baseman John Olerud was placed on the 15-day disabled list and his roster spot was filled by Petagine, who'd had a productive Triple-A season (including a .327 batting average with 20 home runs and 69 RBI in 74 games at Pawtucket).

To start the 2008 season, Petagine played first base for the Diablos Rojos del Mexico of the Mexican League.