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The state flag was made official in 1908, but had been used unofficially before then. This flag included on its reverse the blue shield from the coat of arms containing only a green pine tree, which had been the design of the state naval ensign ever since the Revolutionary War.
Additionally in 1915, the naval ensign was changed to remove the blue shield and leave only the pine tree on a white field. The religious motto "An Appeal to Heaven" was removed from the ensign's design.
The flag of the governor of Massachusetts has the same design as the state flag, but with a triangular shape.
| Flags of the U.S. states |
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| Other inhabited administrative areas |
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| American Samoa | Guam | Northern Mariana Islands | Puerto Rico | Virgin Islands | Washington D.C. |