Justus F. Krumbein (1847 – November 1907) was an architect based in Portland, Oregon, United States, whose work included Richardsonian Romanesque designs and Italianate, cast-iron architecture.

[2] He returned to Hamburg and worked as an architectural drafter for two years, then in 1869 he immigrated to the United States under the name Fritz Krumbein.

Gilbert and Krumbein were selected in 1872 to design the Oregon State Capitol Building in Salem.

[4] When construction was completed in 1876, Krumbein was forced to petition the Oregon legislature for remittance of his unpaid fees in the amount of $733.80.

[11] In 1892 Krumbein designed the Ancient Order of United Workmen Temple at SW Second and Taylor Street in downtown Portland.

[14] Krumbein was one of seven architects chosen to design exhibition halls for the 1905 Lewis and Clark Centennial Exposition.