Election to membership in Gamma Sigma Delta is conducted by the faculty at the local chapter level in accordance with International and local chapter by-laws. Juniors, seniors, graduate students, faculty, alumni, and outstanding individuals in agriculture and related sciences meeting criteria listed below are eligible for membership:

Undergraduate Students: Junior students who scholastically rank in the top 5 percent and senior students who scholastically rank in the upper 15 percent of their class and show promise of leadership may be nominated for membership each year. No more than 15 percent of the senior class can be members of Gamma Sigma Delta.

Graduate Students: Graduate students of outstanding ability with at least a 3.5/A=4.0 or better grade point average and who show great potential for future leadership can be nominated by chapter members and elected.

Faculty: Faculty with at least three years of work in agriculture and related sciences at the initiating university, and who have outstanding performance and achievement in the areas of teaching, research, and/or extension are eligible for election to Gamma Sigma Delta.

Alumni: Alumni are eligible for election five or more years after graduation if they have provided outstanding service to agriculture and have demonstrated their worthiness of the honor.

Honorary: Individuals who are involved in agricultural or related sciences as leaders at the university, community, state, regional, or national level but who are not eligible in the above categories may be invited to membership. Such membership is a prestigious award and is limited to one per chapter per year.