Omeyer & Thori was an architectural partnership of Diedrik A. Omeyer (1850-1907) and Martin P. Thori (1864-1905). The two were immigrants from Norway.

Headquartered in St Paul, a number of the firm's and its individual partners' works are listed on the National Register of Historic Places.

By 1905, Omeyer had retired from the firm due to disability and Thori was suffering from tuberculosis; in January 1905 the firm was renamed Thori, Alban & Fisher with the promotion of William L. Alban (1873-1961) and James E. Fisher to a named partners."Now a Partner." Stevens Point Journal, January 15, 1905. Thori died from tuberculosis in February 1905."Martin P. Thori Dead," The Saint Paul Globe, February 9, 1905.

Works include (with attribution): William H. and Ida Garland House, 846 W. Fairmount Ave., St. Paul "a typically florid production of Norwegian Americans Omeyer and Thori" Arcadia Free Public Library, 406 E. Main St. Arcadia, WI (Omeyer, Diedrik A.), NRHP-listed Bank of Long Prairie, 262 Central Ave. Long Prairie, MN (Omeyer & Thori), NRHP-listed Old Main (Augsburg University), 731 21st Ave., S. Minneapolis, MN (Omeyer, Didrik A.; Thori, Martin P.), NRHP-listed Norman County Courthouse, 16 E.3rd Ave. Ada, MN (Omeyer & Thori), NRHP-listed Old Main, Augustana Academy, Lawler and Second Sts. Canton, SD (Omeyer & Thori), NRHP-listed Park Region Luther College, 715 W. Vernon Ave. Fergus Falls, MN (Omeyer & Thori), NRHP-listed Steensland Library-St. Olaf College, Off St. Olaf Ave. Northfield, MN (Omeyer & Thori), NRHP-listed United Church Seminary, 2481 Como Ave. St. Paul, MN (Omeyer, Didrik A.; Thori, Martin P.), NRHP-listed Ada Village Hall, 404 W. Main St. Ada, MN Thori, Martin P., et al. William E. Coleman House, 500 Missouri Ave. Deer Lodge, MT Ameryre & Thorie Cottonwood County Courthouse, 900 3rd Ave. Windom, MN Omeyer & Thori Metropolitan Opera House (Iowa Falls, Iowa), 515 Washington St. Iowa Falls, IA Omeyer & Thori Nerstrand City Hall, Main St. Nerstrand, MN Thori, Alban, & Fisher Steensland Library-St. Olaf College, Off St. Olaf Ave. Northfield, MN Omeyer & Thori One or more works in Northwood Central Avenue Historic District, roughly, Central Ave. W near 5th St. to 9th St. on the East Northwood, IA (Omeyer & Thori), NRHP-listed

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