Henry John Klutho (1873–1964) was an American architect known for his work in the "Prairie School" style.

The family was Roman Catholic and Henry John attended parochial schools for his elementary education.

[1] The rebuilding of downtown Jacksonville in the aftermath of the Great Fire of 1901 introduced modernism in architecture to Florida.

On May 3, 1901, a small fire had started in a LaVilla mattress factory, and in just over eight hours swept through 146 city blocks.

Klutho introduced himself to prominent local businessmen and politicians, and within a month, he was commissioned to design the six-story Dyal–Upchurch Building, the first large structure in the barren downtown area.

Wright and other Chicago area architects had originated a new American style of architecture that became known as the "Prairie School", which discarded traditional European features of building design, such as Roman arches and Greek columns.

[5] Klutho and other architects in the city enamored of Prairie School architecture designed local buildings with an exuberant Florida flair.

The St. James Building was the featured article in The Western Architect and Klutho's work was highlighted throughout the magazine in June 1914.

The Morocco Temple and the St. James Building still stand, and the Klutho Apartments in Springfield were recently restored and converted into office space by the local Episcopalian charity, Fresh Ministries.

Despite losses over the years, Jacksonville still has one of the largest collections of Prairie Style buildings (particularly residences) outside the Midwest.