Lars Knutson Liestøl (13 June 1839 – 15 December 1912) was a Norwegian politician.
Liestøl served on the district council of Bygland in Aust-Agder, Norway over a 36-year period.
He also was the municipal mayor for twelve years.
He was a member of the Norwegian Parliament during various sessions between the periods 1874-1912.
He served under the government of Prime Minister Johan Sverdrup as Minister of Auditing 1888-1889, as well as head of the Ministry of the Interior in 1888.