OSS Membership is open to any of the following persons:
- Any alumni of the Starehe Schools.
- Past or present member of staff of the Starehe Schools.
- Any past or present member of the governance bodies of the Starehe Schools.
- Any person who has been closely connected with the Starehe Schools for at least ten years, or who has rendered noteworthy contribution, and who is elected by a 75% majority vote at an Annual General Meeting.