A sister city or twin town relationship is a form of legal or social agreement between two geographically and politically distinct localities for the purpose of promoting cultural and commercial ties. The modern concept of town twinning, conceived after the Second World War in 1947, was intended to foster friendship and understanding among different cultures as an act of peace and reconciliation, and to encourage trade and tourism. By the 2000s, town twinning became increasingly used to form strategic international business links among member cities, and may include localities of any scope such as villages, prefectures, or countries.

Yazd is twinned with:

Jaszbereny, Hungary

Yeosu, South Korea

Urumqi, China

Poti, Georgia

Khiva, Uzbekistan

Gyumri, Armenia

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