Diamond Valley is a town in the Calgary Metropolitan Region of Alberta, Canada within Foothills County.

It was established through the provincially approved amalgamation of the former towns of Black Diamond and Turner Valley on January 1, 2023.

Turner Valley withdrew from the discussions after Alberta Municipal Affairs completed a feasibility report on the amalgamation in 1986.

[7] A third amalgamation investigation began in early 2016 through a joint request of Black Diamond and Turner Valley for a provincial grant to undertake a feasibility study.

[3] The Town of Diamond Valley has a seven-person council comprising a mayor and six councillors all elected at-large.