The governor of the Commonwealth of Massachusetts is the head of government of the Commonwealth of Massachusetts. The governor is the head of the state cabinet and the commander-in-chief of the commonwealth's military forces.

Massachusetts has a republican system of government that is akin to a presidential system. The governor acts as the head of government while having a distinct role from that of the legislative branch. The governor has far-reaching political obligations, including ceremonial and political duties. The governor also signs bills into law and has veto power. The governor is a member of the Massachusetts Governor's Council, a popularly elected council with eight members who provide advice and consent on certain legal matters and appointments.

Beginning with the Massachusetts Bay Company in 1629, the role of the governor has changed throughout its history in terms of powers and selection. The modern form of the position was created in the 1780 Constitution of Massachusetts, which called for the position of a "supreme executive magistrate".

Governors of Massachusetts are elected every four years during state elections that are held on the first Tuesday of November after November 1. The most recent Massachusetts gubernatorial election was held in 2022. Following each gubernatorial election, the elected governor is inaugurated on the Thursday after the first Wednesday in January following the election. There are no term limits restricting how long a governor may serve. The longest-serving Massachusetts governor is Michael Dukakis, who served 12 years; Dukakis was in office from 1975 to 1979 and from 1983 to 1991. The current governor is Maura Healey, a Democrat.

Any person seeking to become governor of Massachusetts must meet the following requirements:

The governor is an elected position. The term of office is four years, with no term limit.

Elections for governor are held on a four-year basis concurrently with elections for the offices of lieutenant governor, attorney general, secretary of the commonwealth, state treasurer, and state auditor.

The role of governor has existed in Massachusetts since the Royal Charter of 1628. The original role was one of a president of the board of a joint-stock company, namely the Massachusetts Bay Company. The governor would be elected by freemen, who were shareholders of the company. These shareholders were mostly colonists themselves who fit certain religious requirements. The governor acted in a vice-regal manner, overseeing the governance and functioning of the colony. Originally they were supposed to reside in London, as was the case with other colonial company governors, although this protocol was broken when John Winthrop was appointed governor. The governor served as the executive of the colony, originally elected annually, and were joined by a Council of Assistants. This council was a group of magistrates who performed judicial functions, acted as an upper house of the General Court, and provided advice and consent to the governor. The early governors of Massachusetts Bay were staunchly Puritan colonists who wished to form a state that coincided with religious law.