Tandag City is a fifth class component city and the provincial capital of the province of Surigao del Sur in the island of Mindanao. According to the 2015 census, it has a population of 56,364 people. It has a national secondary airport and a seaport.

The city celebrates the "Diwatahan Festival" on the third week of January in honor of Señor Sto. Niño. It also commemorates "Araw ng Tandag" every September 10 showcasing the city's blissful achievements through the years.

Farming and fishing are the main economic activity for most of the people in Tandag. Chief farm products are rice, corn, and coconut. Livestock and poultry raising are also important sources of income.