Klein Flottbek (Small Flottbek) is a sub-urban district and neighbourhood in the quarters of Nienstedten, Othmarschen and Osdorf, located in the Altona borough of Hamburg, Germany.
The area north of the S-Bahn tracks, including the Loki-Schmidt-Garten, Hamburg's botanical garden, belongs to Osdorf.
Originally, Klein Flottbek municipality belonged to the Pinneberg district in Holstein.
Klein Flottbek station is served by the Hamburg S-Bahn lines S1 and S11.
Klein Flottbek is known for horse-riding in the Derby-Park Klein Flottbek south of the S-Bahn station, where the German Jumping and Dressage Derby [de] is held annually.