Sirdarya Province (Uzbek: Sirdaryo viloyati, Сирдарё вилояти) is a viloyat (province) of Uzbekistan, located in the center of the country on the left bank of Syr Darya River. It borders with (Kazahstan), Tajikistan, Toshkent Province and Jizzakh Province. It covers an area of 5,100 km², and is mostly desert, with the Starving Steppe taking up a significant part of the province's area. The population is estimated to be around 648,100.