Onaga Sojun

• Born: 1617
• Titles: Onaga peechin'
• Other Names: 牧 達村 (Maki Tasson / Mù Dácūn); 思徳 (Umituku)
• Japanese: 翁長 宗淳 (Onaga Sôjun)

Onaga peechin Sôjun, also known by the Chinese-style name Mù Dácūn, was a Ryukyuan scholar-official. He is known for his participation in a 1630 journey to Edo, during which he and several other teenage scholar-officials performed court music and dance at the Satsuma Edo mansion before Shimazu Iehisa, Tokugawa Hidetada, and Tokugawa Iemitsu.

The third head of the Maki/Mù house, he was born in 1617, and in his childhood was known by the name Umituku. Umituku was granted the aristocratic title of satunushi in 1621. In 1629 (at around the age of 12), he was selected to serve as gakudôji (young performer) alongside four or five other young scholar-aristocrats on a journey to Kagoshima and Edo. The embassy departed Naha on 1629/12/14, arriving in Kagoshima in the 2nd month of the following year. They then traveled to Edo, arriving at the Shimazu clan's mansion in the Shiba neighborhood in the 4th month.