Billy Leo Williams (born June 15, 1938) is a former left fielder and coach in Major League Baseball (MLB) who played from 1959 to 1976, almost entirely for the Chicago Cubs. A six-time All-Star, Williams was named the 1961 National League (NL) Rookie of the Year after hitting 25 home runs with 86 runs batted in (RBI). A model of consistent production, he went on to provide the Cubs with at least 20 home runs and 80 RBI every year through 1973, batting over .300, hitting 30 home runs and scoring 100 runs five times each. Along with Ernie Banks and Ron Santo, Williams was one of the central figures in improving the Cubs' fortunes in the late 1960s after the club had spent 20 years in the bottom half of the league standings. His 853 RBI and 2,799 total bases in the 1960s were the most by any left-handed hitter in the major leagues.

In 1970, Williams was the runner-up in voting for the NL Most Valuable Player Award (MVP) after leading the major leagues with 137 runs, 205 hits and 373 total bases, also hitting 42 home runs with 129 RBI, all career highs; excepting his run total, each remains the team record for left-handed hitters. In 1972, he was again the runner-up in MVP voting after winning the NL batting title with a .333 average, adding 37 home runs and 122 RBI while leading the major leagues in total bases and slugging percentage; in both years, he lost the award to Johnny Bench of the Cincinnati Reds. Williams played 1,117 consecutive games between September 1963 and September 1970, holding the NL record from 1969 to 1983. He was traded to the Oakland Athletics after the 1974 season, becoming a designated hitter in the American League (AL), and contributed 23 home runs and 81 RBI to finally reach the postseason as the team won their fifth consecutive division title.

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