Johan Frithiof Isidor "John" Svanberg (1 May 1881 – 11 September 1957) was a Swedish runner.

He competed in the 5 miles and marathon at the 1906 Intercalated Games and 1908 Summer Olympics and won two silver and one bronze medals.

[3] After the 1908 Olympics, Svanberg was deprived of his amateur status for some commercial activities.

He moved to the United States, where he worked as a painter and continued competing in running.

This biographical article relating to Swedish athletics is a stub.