Sint-Katelijne-Waver (, old spelling: Kathelijne-Waver; , ) is a municipality located in the Belgian province of Antwerp. The municipality comprises the towns of Onze-Lieve-Vrouw-Waver and Sint-Katelijne-Waver proper. In 2021, Sint-Katelijne-Waver had a total population of 21,197. The total area is 36.12 km<sup>2</sup>. Roosendael, a ruined relic of a cistercian abbey is situated here and today hosts a youth and touristic centre with pleasant walkways.
Sint-Katelijne-Waver is a centre for market gardening and has many greenhouses. The Mechelse Veilingen in Sint-Katelijne-Waver is the largest co-operative vegetable auction in Europe.