The Diocese of Kankan (Latin: Diœcesis Kankanensis) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Guinea.

It is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Conakry, yet depends on the missionary Roman Congregation for the Evangelization of Peoples.

Its cathedral is the Marian Cathédrale Notre-Dame des Victoires et de la Paix, dedicated to Our Lady of Victories and Peace, in the episcopal see of Kankan.

As of 2014[update], it pastorally served 72,455 Catholics (3.4% of 2,143,000 total) on 118,000 km2 in 14 parishes and 76 missions with 40 priests (32 diocesan, 8 religious), 23 lay religious (14 brothers, 9 sisters) and 7 seminarians.

This article on a Roman Catholic diocese in Africa is a stub.