Sadayuki
# Sadayuki

Sadayuki (written: 貞行 or 定行) is a masculine Japanese given name. Notable people with the name include:

* Ōhikari Sadayuki (大晃 定行, 1927–1996), Japanese sumo wrestler
* Wainai Sadayuki (和井内 貞行, 1858–1922), Japanese businessman
