Song Dao (Thai: ส่องดาว, pronounced [sɔ̀ŋ dāːw]) is a district (amphoe) in the western part of Sakon Nakhon province, northeast Thailand.

Neighboring districts are (from the north clockwise) Sawang Daen Din district and Phang Khon of Sakon Nakhon Province and Chai Wan of Udon Thani province.

As the mountainous area was originally covered with dense forests, it was a popular hideaway of robbers, who robbed travelers on the way between Kalasin and Udon Thani.

After the government cleaned up the area in the 19th century, it was renamed Song Dao, which means 'shining star'.

[1] The minor district (king amphoe) Song Dao was created on 1 April 1972, when the three tambons Song Dao, Watthana, and Tha Sila were split off from Sawang Daen Din district.