Tunnsjø Chapel (Norwegian: Tunnsjø kapell) is a chapel of the Church of Norway in Lierne Municipality in Trøndelag county, Norway.

It is located in the village of Tunnsjø senter.

It is an annex chapel for the Nordli parish which is part of the Namdal prosti (deanery) in the Diocese of Nidaros.

The white, wooden, Neo-Gothic church was built in a long church style in 1876 using plans drawn up by the architect Carl Julius Bergstrøm.

The church was consecrated on 22 April 1876.