Incorporated in 1910, named in honour of Benjamin Disraeli, Earl of Beaconsfield, Prime Minister of the United Kingdom and close confidant of Queen Victoria, the city's historical roots go back as far as 1698.

Beaconsfield, in its current form, was developed as a cottage community by affluent Montreal residents.

Following the Great Peace of Montreal Treaty in 1701, permanent settlement began that led to farming communities along Lake Saint-Louis.

[8][9][10] In 1713, the Parish of St-Joachim de la Pointe Claire was created, which included the present territory of the cities of Beaconsfield, Kirkland and Pointe-Claire.

[10][11] The name Beaconsfield is first attributed to John Henry Menzies who in 1870 bought a country estate then known as "Le Bocage" (originally built by Paul Urgèle Gabriel Valois in 1810).

[8][10][11] The City (Ville) of Beaconsfield was formed on June 30, 1910, when it split off from the Parish of Saint-Joachim de la Pointe-Claire.

[13] According to the Office québécois de la langue française, Beaconsfield has been officially recognized as a bilingual municipality[14] since 2005-11-02.

Education in Beaconsfield, as common in the Montreal area, is operated by school boards divided linguistically.

Stray dogs are held at 303 A Beaconsfield Boulevard for up to three days, and are brought to SPCA West, a no kill shelter, if not claimed.