Matti August Mattson (September 17, 1916 – January 11, 2011) was an American labor organizer, social activist, and Veteran of the Abraham Lincoln Brigade in the Spanish Civil War.

He then worked as a blacksmith's helper at a granite quarry on top of Rollstone Hill in Fitchburg, where a massive glacial boulder stood (it is now on the small triangle on the Upper Common).

[3] In Spain, he was in infantry training for about two weeks and was then assigned to the XIII Brigade Intendencia as a truck driver on the Southern Front.

After Brunete, Mattson transferred to the XV Brigade as a front-line ambulance driver where he was with the Lincoln-Washington Battalion at all of its actions until the Ebro Crossing.

[4]At a march and ceremony for the International Brigades before they left Spain, Mattson heard Dolores Ibárruri, "La Pasionaria", speak.

According to The Volunteer of December 2009, On August 26, 2009, Mattson became the third surviving Lincoln vet to take advantage of one of the key provisions of Spain's controversial "Law of Historical Memory," which allows veterans of the International Brigades to acquire Spanish citizenship without renouncing their other nationality.The ceremony took place in the office of Fernando Villalonga, Spanish Consul General in New York.

[8]On September 6, 2009, Mattson was guest of honor at a dinner organized by the Friends and Family of the Abraham Lincoln Brigade at the Centro Vasco Restaurant on West 23rd Street, New York City.

On January 29, 2010, Mattson was honored with the President's Medal by Fitchburg State College at its Commencement ceremonies.