Space Base Delta 1 (SBD 1) is a United States Space Force unit. It is assigned to Space Operations Command and headquartered at Peterson Space Force Base in Colorado Springs, Colorado, United States.

SBD 1 is responsible for Peterson Space Force Base, Schriever Space Force Base, and Cheyenne Mountain Space Force Station in Colorado; Pituffik Space Base in Greenland; New Boston Space Force Station in New Hampshire; and Kaena Point Space Force Station in Hawaii.

SBD 1 was formerly known as the Peterson-Schriever Garrison (P-S GAR) until its redesignation to Space Base Delta 1 on May 23, 2022. P-S GAR was activated on 24 July 2020, replacing the 21st Space Wing (based at the then Peterson Air Force Base) and the 50th Space Wing (based at the then Schriever Air Force Base).

21st Mission Support (21 MS), Peterson Space Force Base

21st Medical Group (21 MDG), Peterson Space Force Base

821st Space Base Group (821 SBG), Pituffik Space Base