USCGC Alder (WLB-216) is the final Juniper-class, 225-foot (69 m) seagoing buoy tender of the United States Coast Guard.

Alder replaced the previous cutter stationed in Duluth, USCGC Sundew, which retired after 60 years of service.

Alder is designed as a multi-mission vessel, with its missions being Aids to Navigation, Icebreaking, Search and Rescue, Homeland Security, Law Enforcement, and Marine Environmental Protection.

In August 2010 the guided missile destroyer USS Porter and USCGC Alder participated in Operation Nanook 2010 in Baffin Bay and the Davis Straits.

[1] This was the fourth annual Operation Nanook organized by the Canadian Government, but it was the first to host foreign vessels.