Saint-Nicolas (French pronunciation: [sɛ̃ nikɔla]; Walloon: Sint-Nicolai-dlé-Lidje) is a municipality of Wallonia located ine the province of Liège, Belgium.

It is effectively a part of the greater Liège conurbation stretching west from Liège city centre towards Liège Airport. As of January 1, 2006 Saint-Nicolas had a total population of 22,666. The total area is 6.84 km which gives a population density of 3,313 inhabitants per km. It has the highest population density of any Belgian municipality outside the Brussels-Capital Region.

Since 1977 the municipality consists of the following districts: Montegnée, Saint-Nicolas, and Tilleur.

Well known natives include

• Sandra Kim, singer who won the Eurovision Song Contest 1986 held in Bergen, Norway, 1986
• Mario Barravecchia, singer
• Roberto Bisconti, football player
• Georges Theunis, Prime Minister of Belgium, 1921–25, 1934–35.

• List of protected heritage sites in Saint-Nicolas, Belgium

• Media related to Saint-Nicolas, Liège at Wikimedia Commons