Adolf Just (born 8 August 1859, Lüthorst near Dassel, Kingdom of Hanover; died 20 January 1936, Blankenburg (Harz) was a German naturopath.

His main work attracted interest in India and led there to set up a still existing natural medicine hospital in Pune.

Just held a Christianized religious ideology based on the idea that salvation could be regained by understanding how primordial man used to live.

[2] He held the belief that in the beginning, "all creatures, frog and mouse, hedgehog and hare, deer, and elk, fox and badger" all lived in harmony with the Creator.

"[5] Science writer Martin Gardner has noted that "Just's Return to Nature recommended sleeping on bare ground, walking barefooted on wet lawns and sand, and using clay compresses.