Oregon State University's chapter was founded in 1933 and is the oldest senior society on campus. In 1975, Mortar Board began accepting men into what was originally an all female honor society, and by 1978, there were three men total.

Our strong tradition that began in the early 30's still continues today. To date, our chapter has won eight Chapter of Excellence Awards, as well as the Pi Sigma Alpha Award in 1995 for Dean's á la Mode, an event that honors the top ten juniors in a banquet with the dean of their colleges. This original and novel event is now being hosted by numerous chapters across the country.

In 1988, our chapter began selling planners, fondly called "mortar boards", to the students and it is through this fundraising event that we are known across campus.

We are now beginning a new endeavor. In the near future, we hope to have an alumni chapter as strong as our active-member chapter. Through this, we would like to create an endowment in order to provide scholarships to current and applying members, as well as funds for special service projects.