Kyustendil Municipality is a municipality in Kyustendil Province, Bulgaria. The administrative centre is Kyustendil.

According to the latest Bulgarian census of 2011, the religious composition, among those who answered the optional question on religious identification, was the following:

Religious composition of Kyustendil Municipality Orthodox Christianity   85.7% Catholicism   0.2% Protestantism   4.0% Islam   0.1% No religion   4.3% Prefer not to answer, others and indefinable   5.7%