Krusenstern Island (and similar names) is a toponym honoring the Baltic German explorer Adam Johann von Krusenstern (1770–1846). It was and sometimes still is used for a number of places in the Pacific Ocean:

• Ailuk in the Marshall Islands
• Little Diomede (Ignaluk) in the Diomede Islands
• Tikehau in the Tuamotus
• "Krusenstern Reef" was a phantom reef at ; it was deleted from maps after 1923
• "Krusenstern Islands" or "Krusenstern Reef" also was applied to islands in the Northwestern Hawaiian Islands