| Order1: | 56th |
| Office1: | Lieutenant Governor of Massachusetts |
| Term Start1: | January 2, 1947 |
| Term End1: | January 6, 1949 |
| Governor1: | Robert F. Bradford |
| Predecessor1: | Robert F. Bradford |
| Successor1: | Charles F. Sullivan |
| Office2: | President of the Massachusetts Senate |
| Term2: | 1945 - 1946 |
| Predecessor2: | Jarvis Hunt |
| Successor2: | Donald W. Nicholson |
| Office3: | Member of the Massachusetts Senate from the 7th Middlesex District |
| Term3: | 1941 - 1946 |
| Predecessor3: | Joseph R. Cotton |
| Successor3: | George Jelly Evans |
| Office4: | Member of the Massachusetts House of Representatives |
| Term4: | 1937 - 1940 |
| Birth Name: | Arthur William Coolidge |
| Birth Date: | October 13, 1881 |
| Birth Place: | Cumberland County, Maine, U.S. |
| Death Date: | January 23, 1952 (aged 70) |
| Death Place: | Reading, Massachusetts, U.S. |
| Party: | Republican |
| Alma Mater: | Tufts University (1903) Harvard Law School (1906) |
| Profession: | Attorney |
| Spouse: | Mabel Tilton |
| Relations: | Richard B. Coolidge (brother) Calvin Coolidge (cousin) Martha Coolidge (granddaughter) |
| Children: | 2 |
Arthur William Coolidge (October 13, 1881 – January 23, 1952) was a Massachusetts politician who served multiple positions within the state government.[1]
Coolidge was born in Cumberland County, Maine.
Coolidge worked as a lawyer before becoming a member of the Massachusetts House of Representatives (1937–1940) and of the Massachusetts State Senate (1941–1946). From 1947 to 1949 he was the 56th lieutenant governor of Massachusetts. He was the Republican nominee for governor in 1950.
From 1943 to 1947, Coolidge was head of a legislative commission (popularly known as the Coolidge Commission) to address the future of the Boston Elevated Railway (BERy). The commission proposed a number of suburban extensions – some of which were built over the following four decades – and created the plans to reform the BERy as the Metropolitan Transit Authority, the predecessor of the modern Massachusetts Bay Transportation Authority.[2]
A Unitarian and Freemason, Coolidge served as Grand Master of Masons (1943–1944) and a member of the American Bar Association and Theta Delta Chi. In 1951, he was elected as a member of the Massachusetts Society of the Sons of the American Revolution.
A fourth cousin to President Calvin Coolidge, he had one daughter, Dorothy Coolidge Cox and two sons: Robert Tilton Coolidge (1915–1955) and Arthur William Coolidge II.[3] One of his grandchildren is film director Martha Coolidge.[4]
He was brother of Massachusetts politician Richard B. Coolidge.
Coolidge died at his home in Boston and is buried in Forest Glen Cemetery in Reading, Massachusetts. The Arthur W. Coolidge Middle School was named in his honor.