Son of John Adolph Bernard Dahlgren and Sarah Madeleine Vinton.
Dahlgren Memorial Chapel located on the main campus of the university. The chapel was a gift of John Vinton and his wife Elizabeth Drexel, built in memory of their son, Joseph Drexel Dahlgren who died in infancy (1891). He is buried in the chapel in the Dahlgren family crypt.
Georgetown University Medical School Library -Dahlgren Memorial Library - named after him.