Donald F. Humason Jr. (born July 31, 1967) is an American politician who served as mayor of Westfield, Massachusetts from 2020 to 2022 and current town administrator of Chester, beginning September 6, 2022.

[6] He submitted his letter of resignation to Massachusetts Senate President Karen Spilka on December 4 upon being elected Mayor of Westfield.

[12] On March 21, Humason ran for mayor against Michael McCabe, a 34-year captain of the Westfield Police Department.

Neither side declared victory as the results were within the margin of error, but McCabe chose not to seek a recount and conceded.

[16] After his tenure as Mayor of Westfield ended, Humason was chosen by the Chester selectboard to be the next town administrator.