Jennie Johnsen (born 3 December 1977 in Skien) is a Norwegian politician for the Liberal Party.
From 1998 to 2001 she was the leader of the Young Liberals of Norway, the youth wing of the Liberal Party. She was a vice leader of the Liberal Party from 2002 to 2004.
In 1995, at only 17 years of age, she was elected to serve in Skien city council. She held a seat in Oslo city council from 2003 to 2007.
She served as a deputy representative to the Norwegian Parliament from Oslo during the term 2005–2009.