Lužec nad Vltavou is a municipality and village in Mělník District in the Central Bohemian Region of the Czech Republic. It has about 1,500 inhabitants.

The village of Chramostek is an administrative part of Lužec nad Vltavou.

The name Lužec is a diminutive of the Czech word luh (i.e. 'riparian forest').

Lužec nad Vltavou is located about 6 kilometres (4 mi) west of Mělník and 22 km (14 mi) north of Prague. It lies in a flat agricultural landscape in the Central Elbe Table. The municipality is situated on the left bank of the Vltava River.

The first written mention of Lužec nad Vltavou is from 1223. The almost entire village was destroyed by the 1760 fire. In 1890 and 2002, Lužec nad Vltavou was badly damaged by floods.

Historical population

Year Pop. ±% 1869 921 —     1880 1,051 +14.1% 1890 1,266 +20.5% 1900 1,139 −10.0% 1910 1,056 −7.3%	Year Pop. ±% 1921 1,133 +7.3% 1930 1,138 +0.4% 1950 985 −13.4% 1961 1,037 +5.3% 1970 1,300 +25.4%	Year Pop. ±% 1980 1,275 −1.9% 1991 1,244 −2.4% 2001 1,383 +11.2% 2011 1,399 +1.2% 2021 1,423 +1.7%
Source: Censuses

The I/16 road (the section from Mělník to Slaný) passes through the municipality.

The main landmark of Lužec nad Vltavou is the Church of Saint Giles. It was built in the Baroque style in 1762.

• Miloš Jiránek (1875–1911), painter, art critic and writer

• Official website