Neunkirchen-Seelscheid (Kölsch: Nüngkirche-Seelscheidt) is a municipality in the Rhein-Sieg district in the southern part of North Rhine-Westphalia, Germany.

Beside the two principal places Neunkirchen and Seelscheid there are numerous smaller localities among the municipality.

Neunkirchen-Seelscheid is located 20 km north-east of Bonn and 25 km south-east from Cologne in the southern part of the region of Berg (Bergisches Land).

Neighbouring cities are Siegburg, Hennef, Overath and Lohmar.

Beside the two principal places Neunkirchen (5423) and Seelscheid (5788) there are following localities within the municipality (population between brackets) Balensiefen (20), Birken (58), Birkenfeld (174), Birkenmühle (5), Brackemich (106), Breiderheide (3), Breitscheid, Bruchhausen (59), Busch (14), Effert (2), Eich (101), Eischeid (508), Gutmühle (39), Hardt (43), Hasenbach (315), Hausen, Hausermühle (71), Heidgen, Heister (110), Herkenrath (137), Hermerath (342), Hermerather Mühle, Herrenwiesermühle, Hochhausen (397), Hohn (101), Höfferhof, Hülscheid (418), Ingersau (62), Ingersaueler Mühle (6), Kaule (37), Kotthausen, Köbach (112), Krahwinkel (200), Meisenbach, Mohlscheid (383), Nackhausen (319), Niederhorbach (164), Niederwennerscheid (507), Oberdorst (364), Oberheister (413), Oberhorbach (64), Oberste Zeith, Oberwennerscheid (432), Ohlig (10), Ohmerath (31), Pinn (45), Pixhof, Pohlhausen (492), Rehwiese (6), Remschoß (254), Rengert (222), Renzert (64), Rippert (128), Schaaren, Scherpekotten (2), Scherpemich, Schöneshof (454), Siefen (34), Söntgerath (134), Stein (125), Steinermühle (19), Straßen (84), Unterste Zeith, Wahlen (22), Wahn (197), Weiert (32), Wende (4), Weesbach, Wiescheid, Wolperath (1288) The 40 seats of the municipal council are distributed as follows since the September 2020 elections: