Aston-Jonction (French pronunciation: [astɔn ʒɔ̃ksjɔ̃]), formerly known in English as Aston Junction, is a municipality in the Centre-du-Québec region of the province of Quebec, Canada. The population as of the Canada 2021 Census was 441.

Population trend:

Census	Population	Change (%)
2021	441	4%
2016	424	3.4%
2011	410	8.8%
2006	377	8.9%
2001	414	4.4%
Merger	433 (+)	50.6%
1996	214	5.4%
1991	203	N/A

(+) Amalgamation of the Parish of Saint-Raphaël-Partie-Sud and the Village of Aston-Jonction on March 26, 1997.

Mother tongue language (2006)

Language	Population	Pct (%)
French only	355	97.26%
English only	10	2.74%
Both English and French	0	0.00%
Other languages	0	0.00%

The Aston Junction railway station of Canadian National Railway was served by The Scotian passenger train in 1954. It was 88.8 miles by rail from Montreal.

• List of municipalities in Quebec