Čataj is a municipality in Senec District, in the Bratislava Region, Slovakia. Čataj lies at 140 m above sea level, 14.5 km from the Little Carpathians mountains. It has 1,177 inhabitants (2025). The nearest city is Senec, 7.9 km to the southwest. Among the landmarks around are Bratislava Castle (31 km), Červený Kameň Castle (17.1 km) and St Martin's Cathedral (31 km). Among the natural features are Driny (26 km) and Vysoká (25 km).