USCGS Katherine Walker (WLM-552) is a Keeper-class coastal buoy tender of the United States Coast Guard. Launched in 1996, she has spent her entire career homeported at Bayonne, New Jersey. Her primary mission is to maintain 335 aids to navigation in New York Harbor, Long Island Sound, and surrounding waters. She is assigned to the First Coast Guard District.

The Keeper class of coastal buoy tenders consists of fourteen ships built for and operated by the United States Coast Guard. The ships were launched between 1995 and 1999 and all remain in active service. Their primary mission is to maintain thousands of aids to navigation, both buoys and land-based. Their secondary missions include marine environmental protection, search and rescue, law enforcement, and light ice-breaking.