Alicyclobacillus tengchongensis is a species of Gram positive, strictly aerobic, bacterium.

The bacteria are acidophilic and produced endospores.

It was first isolated from soil in a hot spring in Tengchong, China.

The species was first described in 2014, and the name refers to the city from which it was first isolated.

[1] The optimum growth temperature for A. tengchongensis is 45 °C, and can grow in the 30-50 °C range.