Telekom Srbija (full legal name: Preduzeće za telekomunikacije Telekom Srbija a.d.) is a telecommunications company based in Serbia, with its headquarters in Belgrade. The company provides a range of fixed line, mobile, and Internet communications services in Serbia, Bosnia and Herzegovina and Montenegro.

According to its most recent annual financial report submitted to Serbian Economic Register Agency, the company has 10,198 employees and it posted an annual profit of RSD11,573,270,000 (approximately €145 million at the time) for the calendar year 2007.

In 2012, Greek telecommunications provider OTE sold it's 20% stake back to Telekom Srbija for €380 million.

On May 3 2012 Government of Serbia has transferred ownership of 6,96% shares to the employes of Telekom Srbija, and 15% of shares to citizens of Serbia. Government of Serbia now owns 78,04% of shares.

Mobile Telephony of Serbia (mt:s) is mobile telephone subdivision of Telekom Srbija, which was found in June 1997. The company has wide range of offers to business and private clients, while the latest is 3G technology, introduced in late 2006.