Karolin may refer to the following places:

• Karolin, a neighbourhood and power plant in the Nowe Miasto district of Poznań
• Karolin, Greater Poland Voivodeship (west-central Poland)
• Karolin, Kuyavian-Pomeranian Voivodeship (north-central Poland)
• Karolin, Gmina Garbów in Lublin Voivodeship (east Poland)
• Karolin, Gmina Zakrzew in Lublin Voivodeship (east Poland)
• Karolin, Łęczna County in Lublin Voivodeship (east Poland)
• Karolin, Białobrzegi County in Masovian Voivodeship (east-central Poland)
• Karolin, Zwoleń County in Masovian Voivodeship (east-central Poland)
• Karolin, Podlaskie Voivodeship (north-east Poland)
• Karolin, Pomeranian Voivodeship (north Poland)
• Karolin, an island in the novel The Garden of God

• USS Haven (AH-12)
• USS Haven (APH-112)
• USS Hawaii
• USS Hawaii (CB-3)
• USS Hawaii (SSN-776)
• USS Hawes
• USS Hawes (FFG-53)
• USS Hawkbill
• USS Hawkbill (SS-366)
• USS Hawkbill (SSN-666)
• USS Hawkins
• USS Hawkins (DD-873)
• USS Hayler
• USS Haynes
• USS Haynes (DE-181)
• USS Hazard (AM-240)
• USS Hazelwood
• USS Hazelwood (DD-107)
• USS Hazelwood (DD-531)
• USS Heermann
• USS Heermann (DD-532)
• USS Helena
• USS Helena (CA-75)
• USS Helena (CL-113)
• USS Helena (CL-50)