The 19th U-boat Flotilla (German 19. Unterseebootsflottille) was a unit of Nazi Germany's Kriegsmarine during World War II.
It was founded in October 1943 as a Training Flotilla (Ger. Ausbildungsflottille) where future commanders received their basic training (Kommandanten-Vorschule), under the command of Korvettenkapitän Jost Metzler. Originally based at Pillau, it relocated to Kiel in February 1945. It was disbanded in May 1945 when Germany surrendered.
Four U-boats were assigned to this flotilla during its service.