The Rosarium Uetersen is a rose garden located in the Rosenstadt Uetersen, Schleswig-Holstein, Germany, and is the oldest and largest rose garden in Northern Germany.

[1] Today's rosarium was created between 1929 and 1934, and opened to the public on the occasion of the 700 year festivities of Uetersen on June 23, 1934.

[2] The park, originally designed by landscaping architect Berthold Thormählen and three well-known German rose breeders from Holstein, Mathias Tantau, Wilhelm Kordes, and Krause,[3] covers at present over seven hectares, and is open to the public.

During the last eighty years, the rose garden was altered several times due to weather influences, extensions, and reorganisations.

[4] Several rose cultivars were called either after the city or the rose garden itself, for instance the pink climber 'Rosarium Uetersen' (Kordes 1977), its two sports 'Uetersens Rosenkönigin' and 'Uetersens Rosenprinzessin' (both discovered by Kordes and introduced in 2009), and the cream-coloured climber 'Uetersener Klosterrose' (Evers/Tantau 2006).