Boldog is a municipality in Senec District, in the Bratislava Region, Slovakia. Boldog lies at 123 m above sea level, 14.0 km from the Little Carpathians mountains. It has 538 inhabitants (2025). The nearest city is Senec, 2.9 km to the southwest. Among the landmarks around are Bratislava Castle (27 km), St Martin's Cathedral (26 km) and Slovak National Museum (26 km). Among the natural features are Vysoká (25 km) and Driny (29 km).