Hamm () is a municipality in the district of Altenkirchen, in Rhineland-Palatinate, Germany. It is situated on the river Sieg, approx. 10 km north-east of Altenkirchen, and 40 km east of Bonn.
Hamm is the seat of the Verbandsgemeinde ("collective municipality") Hamm (Sieg). It is the home of the Raiffeisenmuseum honouring Friedrich Wilhelm Raiffeisen who pioneered rural credit unions.
Tom Kalender (born 2008), racing driver
The nearest train station is Au (Sieg) on the Sieg Railway (Cologne - Siegen).