Motoyama-juku (本山宿, Motoyama-juku) was the thirty-second of the sixty-nine stations of the Nakasendō.
It is located in the central part of the present-day city of Shiojiri, Nagano Prefecture, Japan.
Motoyama became a post town in 1614, when the Nakasendō's route was changed.
It became a post town at the same time as Shiojiri-juku and Seba-juku.
It became known throughout the country for its soba noodles.