Carl-Hermann Gustav "Calle" Schlettwein (born 13 June 1954) is a Namibian politician who has served in the country's cabinet since 2012.

[1] Beginning at Namibian Independence in 1990, Schlettwein served as permanent secretary in various ministries.

[3] In a Cabinet reshuffle following the 2012 SWAPO congress, Schlettwein was promoted to Minister of Trade and Industry on 4 December 2012.

[5] Under president Hage Geingob, Schlettwein was moved to the post of Minister of Finance in March 2015.

[6] After Geingob's reelection in 2019, Schlettwein was moved to lead the Ministry of Agriculture, Water and Land Reform.