Liernu is a village of Wallonia and a district of the municipality of Éghezée, located in the province of Namur, Belgium.

Liernu is best known for its centuries old Big Oak Tree (50°35′03″N 4°49′40″E / 50.58412°N 4.82765°E / 50.58412; 4.82765), one of the largest and oldest in continental Europe. The tree took part in the "European Tree of the Year" competition in 2016 as a representative of Belgium.

Liernu had 806 inhabitants as of March 2006, and extends over 625 hectares (1,540 acres).

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• Media related to Liernu at Wikimedia Commons
• (in French) An association devoted to the Oak Tree in Liernu

50°35′03″N 4°49′50″E / 50.584183°N 4.830536°E / 50.584183; 4.830536