Nathan Smith Davis Jr. (September 5, 1858 – December 22, 1920) was an American physician and professor.

Nathan Smith Davis Jr. was born September 5, 1858, in Chicago, Illinois.

[1] He was the son of Nathan Smith Davis, a founder of Northwestern University.

In 1893, he was named chairman of the Section of Practice in the Illinois State Medical Society.

[2] Howard Van Doren Shaw designed a house for Davis in Lake Forest, Illinois, in 1898.