The Douglas College Student Society (DCSS) was incorporated in 1972 under the Society Act with a mandate to represent and protect the rights and interests of students. The makeup of the Society's executive membership has changed over time, but typically included a President, Vice President(s), Secretary, Treasurer, and campus- or program-specific representatives. At different times in the history of the DCSS, the records of the Executive were collected by a staff person who was also responsible for the management of Society business/administration.
When the DCSS was formed it represented students from three campuses: New Westminster, Surrey, and Richmond. For this reason, the earliest governing body of the DCSS - the Student Council - was also sometimes called the Tri-Council. By 1979, five additional campuses were also being represented by the DCSS: Coquitlam, Langley, Maple Ridge, Agnes Street, and Newton Centre. Consequently, the DCSS's governing body became the Multi Campus Council. In the early 1980s, following the College's split into two separate institutions, the DCSS updated its Constitution and its governing body was reorganized as the Senate. Rather than a campus-specific focus like its predecessor, the Senate used a model of representation based on areas of study.
In 1992, DCSS membership voted to leave the Canadian Federation of Students, only to re-join the national organization six years later. In 1999, the DCSS underwent a restructuring in which it was renamed the Douglas Students' Union (Canadian Federation of Students, Local 18).