Björn Bernt Ewald Ferm (born 10 August 1944) is a Swedish modern pentathlete.

He competed at the 1968 and 1972 Summer Olympics and won an individual gold medal in 1968.

[1] In 1968, his team finished third but was stripped of the bronze medal after one member failed a drug test (for alcohol).

Nationally he collected 12 titles that included one in épée fencing and 11 in modern pentathlon, five individual and six with a team.

After retiring from competitions he became an Asia-based businessman, and as of 2009 headed a company exporting ink cartridges and toners.