Saint-Léger-du-Bourg-Denis (French pronunciation: [sɛ̃ leʒe dy buʁ dəni]) is a commune in the Seine-Maritime department in the Normandy region in northern France.

Saint-Léger-du-Bourg-Denis is a light industrial suburban town surrounded by woodland and situated in the Roumois, just 3 miles (4.8 km) east of the centre of Rouen at the junction of the D42 and the D138 roads.

The current official name of the town derives from a mistaken etymology dating back to French Revolution. Political authorities have retained and not reformed this quaint error to the present day. A more rational name would be "Saint-Léger-Bourdeny", after its ancient name "Bourdeny", a Gallo-Roman toponym in -acum, formed with the Germanic personal name Burdinus, thus Burdiniacum > Bourdeny. Burdinus, a given name, gave rise to the patronymic surnames Bourdain and Bourdin, common in west central France.

A similar name can be found in the Merovingian toponym Bourdainville.

The arms of Saint-Léger-du-Bourg-Denis are blazoned : Gules, a chevron between 2 leopards heads and a spindle bendwise sinister argent.

Historical population

Year	Pop.	±% p.a.
1968	2,144	—
1975	2,381	+1.51%
1982	2,953	+3.12%
1990	2,772	−0.79%
1999	3,124	+1.34%
2007	3,263	+0.55%
2012	3,449	+1.11%
2017	3,450	+0.01%
Source: INSEE

• The church of St.Léger, dating from the sixteenth century.
• The debris of a tenth-century castle.

• Communes of the Seine-Maritime department

• Official website of Saint-Léger-du-Bourg-Denis (in French)