The Student Government Association (SGA) Senate is composed of full-time day students at Westfield State University who represent the broad scope of interests of the undergraduate student body. 
Each Class Council—First-Year, Sophomore, Junior, and Senior—holds five senate seats, one of which is the Class President. Every Residence Hall is represented by one Representative for every 100 residents, ensuring residential students have a voice in campus decision-making. The Commuter population is represented by the Commuter Council President and one Commuter Representative for every 250 commuting students. 
The Senate also includes six Representatives at Large, one elected from each class year, who advocate on behalf of the entire student body regardless of class, residence, or commuter status. 
Additionally, students are represented by College Representatives, with two Representatives elected from the College of Arts and Sciences, and two Representatives elected from the College of Professional Studies. A Transfer Student Representative, elected by transfer students, also serves within the Senate. 
Several appointed positions complement the elected members of the Senate, ensuring representation for key student populations and programs. These include: 
- The Campus Activities Board Representative, appointed by the Campus Activities Board Executive Board 
- The Student Athlete Representative, appointed by the Student Athletic Advisory Council 
- The First-Generation Representative, appointed by the Lead Scholars Program 
- The Banacos Academic Center Representative, appointed by the Banacos Center 
- The Veteran and Military Services Representative, appointed by the Veteran and Military Services Center 
Together, these members form a representative body committed to amplifying student voices, addressing campus concerns, and fostering a more inclusive and engaged university community.