Ray Williston Collins (February 11, 1887 – January 9, 1970) was a starting pitcher in Major League Baseball who played his entire career for the Boston Red Sox.

Collins missed the first two months of the 1912 season with a knee injury, during which time the Red Sox christened their new stadium, Fenway Park.

The only left-hander in Boston rotation, Collins was considered the second-best on the pitching staff behind Smoky Joe Wood (34–5) as the Red Sox clinched the American League pennant.

Collins was supposed to start again in Game Six, but Red Sox manager Jake Stahl opted by Buck O'Brien, coming off a 20–13 season.

Collins picked up his 19th and 20th victories on September 22, by pitching complete games in both ends of a doubleheader against the Detroit Tigers at Navin Field, winning by scores of 5–3 in the opener and 5–0 in the nightcap.

In 1915, the Red Sox were in the enviable position of having too many good (and younger) pitchers: Rube Foster, Ernie Shore, Dutch Leonard, and Babe Ruth made up the best rotation in major league baseball.

After the season the Red Sox expected him to take a cut in his $5400 salary, but Collins, at age 29, announced his retirement from professional baseball stating simply that he was "discouraged by his failure to show old-time form."

During and after his baseball career, he was a dairy farmer in Colchester, Vermont, operating the family farm until 1960, and was co-founder of the Burlington Milk Cooperative Creamery (later part of HP Hood).