The Cathedral Basilica of the Immaculate Conception is the cathedral of the Archdiocese of Denver of the Roman Catholic Church. It is located at the corner of Logan St. and Colfax Avenue in the North Capitol Hill neighborhood of central Denver. Construction of the cathedral started in 1902 and was completed in 1911 with a final cost of approximately $500,000. Its inaugural Mass was held on October 27, 1912, and consecration in 1921. The cathedral was raised to the status of minor basilica on Christmas of 1979 - one of only 29 American cathedrals with that title.

Architect Leon Coquard of Detroit, designed the cathedral in the French Gothic style. Its character is influenced by the 13th century Saint Nicholas Collegiate church (collégiale Saint-Nicolas) of Munster, Moselle, France- the birth village of bishop Nicholas Chrysostom Matz, who supervised its construction. The building features two 210-foot (64 m) spires, and is made of limestone from Indiana, and granite from Gunnison, Colorado. The altar, statuary, and bishop's chair are all composed of marble from Carrara, Italy; the 75 stained glass windows are from Franz Xaver Zettler's Royal Bavarian Art Institute in Munich.

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