Ronald "Ronnie" Belliard (born April 7, 1975 in The Bronx, New York) is a second baseman of Dominican descent who currently plays for the Washington Nationals. Belliard, an All-Star in 2004, is well known for playing out on the outfield grass. Belliard was drafted by the Milwaukee Brewers in the 8th round of the 1994 Major League Baseball Draft, and is a cousin of former major league shortstop Rafael Belliard.

In 1999, Belliard was named Milwaukee Brewers player of the year. Ronnie began the season at Triple A Louisville before being recalled on May 11. He finished the season tops among National League rookies in almost every offensive category, including batting average (1st), runs batted in (6th), multi-hit games (4th), runs (6th), hits (4th), total bases (5th), doubles (2nd), triples (T-3rd), hitting streaks (T-5th), walks (1st), on-base percentage (1st), slugging percentage (3rd) and extra base hits (4th). Ronnie hit his first Major league home run and drove in his first run with a solo shot May 15.

In 2000, Belliard established career highs in several categories, including games (152), runs scored (83), hits (150) and doubles (30) while setting the Brewers' National League franchise record with career-high 9 triples.