Katja Riem (German pronunciation: [ˈkatja ˈriːm]; born 26 December 1996) is a Swiss winemaker and politician who currently is a member of the National Council (Switzerland) for the Swiss People's Party after being elected in the 2023 Swiss federal election.^[1][2] She assumed office on 4 December 2023.^[3] Riem previously served on the Grand Council of Bern between 2021 and 2023.^[4][5]

Riem was born 26 December 1996 in Oberdiessbach, Switzerland, to Herbert Riem, wine merchant and farmer, and Beatrice Riem (née Utiger).^[6][7] Her parents are the owners of Riem Daepp & Co Ltd., wine merchants, founded in 1933.^[8] Her paternal uncle, Bernard Riem, is a member of the Grand Council of Bern for The Centre.^[9]

She was raised in Kiesen and obtained her Matura at Gymnasium Kirchenfeld in Bern. Upon graduating, she completed a 3-year-program in winemaking which she was able to complete early in only 2 years while working in Bern, La Neuveville and in the winery of Teufen Castle in Teufen. Then she completed a 3-year apprenticeship as farmer. At the Bern University of Applied Sciences (HAFL) she received a Bachelor of Science in agronomy.^[10]

She became an active member of the Young SVP aged 14 and was ultimately elected to Grand Council of Bern on 1 September 2021. There she has been the youngest member-elect and became prominent on land use issues. She resigned from this post on 31 October 2023 being succeeded by Roland Iseli.^[11] During the 2023 Swiss federal election, Riem was elected to National Council (Switzerland). She assumed office as the youngest member of the 52. legislative period on 4 December 2023.^[12][13][14]

Riem resides is single and resides in Kiesen, Switzerland.