John Gideon Haskell (February 5, 1832 – November 25, 1907) was an architect who designed portions of the Kansas State Capitol and other public buildings in the state.
He joined the Union army during the American Civil War. After the war he was named official state architect and as such finished the work on the Kansas State Capitol.
He was recruited by county commissioners of Greenwood County and Chase County in east central Kansas to design their courthouses, which he did in 1871, and he designed other courthouses as well.[3]: 29–30