Treklyano Municipality (Bulgarian: Община Трекляно, trl Obština Trekljano) is a municipality in Kyustendil Province, Bulgaria. The administrative centre is Treklyano.

According to the 2021 Census, the municipality of Treklyano has only 434 inhabitants living in 19 small villages. This makes Treklyano the smallest municipality in entire Bulgaria.

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 Treklyano Municipality Orthodox Christianity   93.0% Catholicism   0.8% Protestantism   0.0% Islam   0.0% No religion   4.3% Prefer not to answer, others and indefinable   1.9%