Stelmužė is a village in Zarasai district municipality of Lithuania. It is directly west of the border with Latvia.

There is a wooden chapel built in 1650 not using saws or iron nails; it is the oldest wooden religious building in Lithuania. Stelmužė is also known for the Tower of Slaves (), a rectangular building constructed of stone and bricks in the 18th century, used for imprisonment of serfs. It was restored and registered as a 17th century architectural cultural monument.Legendomis apipintas dvaras slepia itin žiaurią istoriją: bokšte kalino baudžiauninkus, juos mainė į šunis

The village is famous for its Stelmužė Oak, the oldest in Lithuania and one of the oldest in Europe. The oak is about one and a half thousand years old. It is often called the tree that is "older than Lithuania itself." It has been through a long range of historical events, having had sacrifices by pagan priests conducted under it and a skeleton and rifle of a Napoleonic soldier found in its cavity.

It was nominated for Tree of the Year in 2017, receiving 12th place and 5,245 votes.

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