Jakob Jóhann Sveinsson (born 24 November 1982 in Reykjavík, Iceland)[1] is a 4-time Olympic swimmer from Iceland who started swimming for S.C. Ægir in 1991.

He swam for Iceland at the 2000, 2004, 2008 and 2012 Summer Olympics.

[2] At the 2000 Olympics, he swam to Iceland's high-ever result in Olympic swimming in finishing 25th.

At the 2009 World Championships he swam to new national records in all 3 breaststroke events: 50 (28.03), 100 (1:01.31) and 200 (2:12.39).

This biographical article related to an Icelandic swimmer is a stub.