Millan House is a historic co-op in Lenox Hill on the Upper East Side of Manhattan in New York City.

[1] The buildings are contributing properties to the Upper East Side Historic District.

[2] Early tenants included Simon Flexner, Herbert L. Pratt Jr. (the son of Herbert L. Pratt) and Witherbee Black (of the family silversmith firm Black, Starr & Frost-Gorham).

[1] By 1947, tenant J. W. Boardman Milligan insisted upon turning the rent-only building into a co-op.

[1] Later, Frank K. Houston, the chairman and chief executive officer of the Chemical Bank, lived here until his death in 1973.