|721st Operations Support Squadron|
|Active||10 October 2019 – present|
|Branch||United States Space Force|
|Part of||Space Delta 3|
|Headquarters||Peterson Space Force Base, Colorado, U.S.|
|Commander||Lt Col Etan D. Funches|
|Former 721st Operations Support Squadron patch|
The 721st Operations Support Squadron (721 OSS) is a United States Space Force unit. Assigned to Space Operations Command's Space Delta 3, it provides training, intelligence, tactics, and operations support to the delta. Headquartered at Peterson Space Force Base, Colorado, it was activated on 10 October 2019 following the establishment of the 721st Operations Group which was later redesignated to Space Delta 3.