Sonia Rosa Chang-Díaz (born March 31, 1978) is an American politician who served in the Massachusetts Senate from the 2nd Suffolk district as a member of the Democratic Party.

She entered politics while serving as a legislature aide for Massachusetts Senator Cheryl Jacques and as a campaign manager for MassEquality.

[4] She worked as one of Senator Cheryl Jacques' legislative aides and was a campaign manager for MassEquality.

[5] Wilkerson defeated Chang-Díaz in the initial primary, but a judge ordered a recount due to write-in votes not being counted in eight precincts.

[7] Secretary of State William F. Galvin started an investigation into Boston's handling of elections due to the error.

[25][26][27] She was speculated as a possible candidate for the 2013 Boston mayoral election, but did not run and instead endorsed Marty Walsh.

[33][34] Chang-Díaz was critical of legislation passed by the Massachusetts Senate which targeted the ability of undocumented immigrants to obtain services from the state including Medicaid and public housing.