The Diocese of Vénh Long () is a Roman Catholic diocese in southern Vietnam. The current bishop is Peter Huỳnh VÃÂn Hai, since October 2015.
The creation of the diocese in present form was declared November 24, 1960.
The diocese covers an area of 6,772 kmò, and is a suffragan diocese of the Archdiocese of Ho Chi Minh City.
By 2014, the diocese of Vénh Long had about 199,404 Catholics (4.5% of the population), 179 priests and 209 parishes.
St. AnneâÂÂs Cathedral in Vénh Long town has been assigned as the Cathedral of the diocese.