Norlin Quadrangle Historic District, historic district on the University of Colorado campus in Boulder, Colorado, United States

The Norlin Quadrangle Historic District covers much of the land donated to the University of Colorado in 1872 and holds twelve buildings. Old Main (1876) is Victorian brick; Hale Science and Woodbury are stone in Gothic or Romanesque Revival styles; Charles Klauder's 1919 plan shaped later buildings such as Norlin Library (1939) and Hellems (1921).

The land was donated to the university in 1872 by six Boulder residents, marking an important moment for the community and institution's growth. Old Main from 1876 stands as one of the oldest buildings, while later additions like Macky Auditorium were built between 1902 and 1922.

The district's name honors George Norlin, a former university president, and reflects the connection between the institution and the city. The buildings display various architectural styles that show how different tastes and ideas influenced their design.

The area is easy to explore with walking paths and wheelchair-accessible areas in some sections. Wear comfortable shoes, as the paths are mainly concrete or gravel.

Architect Charles Klauder shaped many of the buildings with his designs, distinguishing several structures with his particular style. The district was added to the National Register of Historic Places in 1980, protecting these significant buildings for future generations.