| John Brown | |
| Birth Date: | c. 1838 |
| Birth Place: | Denmark |
| Placeofburial Label: | Place of burial |
| Allegiance: | United States |
| Branch: | United States Navy |
| Rank: | Captain of the Afterguard |
| Awards: | Medal of Honor |
John Brown (born c. 1838, date of death unknown) was a United States Navy sailor and a recipient of the United States military's highest decoration, the Medal of Honor.
A native of Denmark, Brown immigrated to the U.S. and joined the Navy from Maryland. By May 10, 1866, he was serving as captain of the afterguard on the . On that day, while the De Soto was off the coast of Eastport, Maine, he and two shipmates rescued two sailors from the from drowning. For this action, he and his shipmates, Seaman Richard Bates and Seaman Thomas Burke, were awarded the Medal of Honor three months later, on August 1.
For heroic conduct with 2 comrades, in rescuing from drowning James Rose and John Russell, seamen, of the U.S.S. Winooski, off Eastport, Maine, 10 May 1866.