Kaynardzha Municipality (Bulgarian: Община Кайнарджа) is a municipality (obshtina) in Silistra Province, Northeastern Bulgaria, located in the Danubian Plain, in the area of the South Dobrudzha geographical region, bounded on the north with Romania.

[2] The main road II-71 crosses the area from northwest to southeast, connecting the province centre of Silistra with the city of Dobrich.

Kaynardzha Municipality includes the following 15 places all of them villages: The following table shows the change of the population during the last four decades.

As of 2016, it is one of the few places in Bulgaria with a natural population growth: there were a total of 87 live births, while 66 people died.

Bulgarians constitutie the largest minority, followed by a large Roma population.