Genappe (; , ; ) is a municipality and city of Wallonia located in the Belgian province of Walloon Brabant.
As of 2023, the municipality of Genappe boasted a population of 14,266 residents. Spanning a total area of 89.57 km<sup>2</sup> , the region has a population density of 15,26 inhabitants per km<sup>2</sup>.
Although his birthplace was probably Boulogne-sur-Mer, one 13th-century chronicler cites Baisy (now Baisy-Thy in Genappe), as the birthplace of Godfrey of Bouillon, the best-known leader of the First Crusade (1096-1099).
The Genappe post-office opened before 1830. It used a postal code 48 with bars (before 1864), and 145 with points before 1870. BOUSVAL opened on 8 April 1880.
Postal codes in 1969 (before the merger of municipalities in 1977): - 1470 Genappe - 1471 Loupoigne - 1472 Vieux-Genappe - 1473 Glabais - 1474 Ways - 1475 Baisy-Thy - 1476 Houtain-le-Val - 1488 Bousval.