So Yoshitada

Grave of Sô Yoshitada at Banshô-in temple on Tsushima

• Other Names: 啓祐院殿 (Keiyû-in dono)
• Japanese: 宗 義質 (Sô Yoshitada)

Sô Yoshitada was the 30th head of the Sô clan and 13th Edo period lord of Tsushima han.

He was the second son of Sô Yoshikatsu, and succeeded him as lord of Tsushima in 1813. Prior to that, he served as proxy for his father in receiving the 1811 Korean embassy to Japan, when Yoshikatsu was too ill to do so himself.

Preceded by: Sô Yoshikatsu (Tomiju)

Lord of Tsushima han 1813-1838

Succeeded by: Sô Yoshiaya