Hamm (Sieg) is a Verbandsgemeinde ("collective municipality") in the district of Altenkirchen, in Rhineland-Palatinate, Germany. The seat of the Verbandsgemeinde is in Hamm (Sieg).

The Verbandsgemeinde Hamm (Sieg) is located in the northwestern part of the district of Altenkirchen. It borders the municipalities Windeck and Morsbach in its west and north and the Verbandsgemeinden Altenkirchen and Wissen in its south and east.

The Verbandsgemeinde Hamm (Sieg) consists of the following Ortsgemeinden ("local municipalities"):

	Municipality	Area (km)	Population
	Birkenbeul	4.76	433
	Bitzen	2.30	711
	Breitscheidt	3.66	955
	Bruchertseifen	2.89	750
	Etzbach	3.05	1,330
	Forst	4.25	576
	Fürthen	2.20	1,168
	Hamm (Sieg) ¹	3.66	3,380
	Niederirsen	2.84	103
	Pracht	5.50	1,467
	Roth	3.80	1,458
	Seelbach bei Hamm	3.40	131
	Verbandsgemeinde Hamm (Sieg)	42.31	12,462

¹ seat of the Verbandsgemeinde

Development of the population in the region, that is Hamm (Sieg) today:

Year Population 1815 2,175 1835 2,814 1871 ¹ 4,424 1905 ¹ 5,527 1939 ¹ 6,881

Year Population 1950 ¹ 7,482 1961 ¹ 8,195 1970 ¹ 9,664 1987 ¹ 10,297 2011 ¹ 12,463

¹ Census results

The council of the Verbandsgemeinde Hamm (Sieg) consists of 28 voluntary members. Its chairman is the Bürgermeister.

The blazon of the coat of arms of Hamm (Sieg) is:

In Rot silberner Wellenschrägbalken nach links, belegt mit blaubewehrtem und -gezungtem goldenen Leopard, der in den Pranken ein silbernes Kammrad hält, im Schildfuss silberne Hammer und Schlegel schräggekreuzt. Im silbernen Schildbord 13 grüne Kugeln.

In state elections Verbandsgemeinde Hamm (Sieg) is part of electoral district 02-Altenkirchen, in federal elections it's part of electoral district 198-Neuwied.