Klapý is a municipality and village in Litoměřice District in the Ústí nad Labem Region of the Czech Republic. It has about 500 inhabitants.

Klapý is located about 14 kilometres (9 mi) southwest of Litoměřice and 26 km (16 mi) south of Ústí nad Labem. It lies in a flat agricultural landscape of the Lower Ohře Table. The highest point is the Hazmburk hill at 418 m (1,371 ft) above sea level.

The first written mention of Klapý is from 1197, when a part of the village was donated to the Teplá Abbey. In 1237, the abbey bought the second part of the village. In the second half of the 13th century, Klapý Castle was founded on a hill above the village. In 1300, the estate was owned by the Lichtemburk family.

The Klapý estate was then shortly owned by King John of Bohemia, who sold it to the Zajíc of Valdek family. From 1341, the castle was known as Hazmburk and the family called themselves Zajíc of Hazmburk. The family held the Hazmburk estate until 1558, when they sold it to the Lobkowicz family. In 1586, the castle was described as abandoned and Klapý was a part of the Libochovice estate. In 1613, the estate was acquired by the Sternberg family. From 1676 until 1849, the estate was owned by the Dietrichstein family.

Historical population

Year Pop. ±% 1869 709 —     1880 761 +7.3% 1890 800 +5.1% 1900 772 −3.5% 1910 903 +17.0%	Year Pop. ±% 1921 851 −5.8% 1930 862 +1.3% 1950 640 −25.8% 1961 634 −0.9% 1970 565 −10.9%	Year Pop. ±% 1980 570 +0.9% 1991 486 −14.7% 2001 532 +9.5% 2011 489 −8.1% 2021 474 −3.1%
Source: Censuses

There are no railways or major roads passing through the municipality.

There is a ruin of the medieval Hazmburk Castle (also spelled Házmburk) on the Hazmburk hill. Today it is owned by ste state and is open to the public. The so-called White Tower serves as a lookout tower.

The Church of Saint John the Baptist was built in the Gothic style in the 14th century and restored in 1493. In 1779, it was rebuilt in the Baroque style.

• Lubor J. Zink (1920–2003), Czech-Canadian writer

• Official website