Thomas Hannah (1867–1935) was a Scottish-American architect based in Pittsburgh in the United States.
[1] He is credited with designing the Saint Nicholas Greek Orthodox Cathedral.
He also designed Midtown Towers, originally known as the Keenan Building and built in 1907.
[6] Hannah came to Pittsburgh in the late 1800s[1] and began his career as a draftsman in the office of William Smith Fraser.
Plans for a Presbyterian church at Hamilton and Lang avenues, alterations to the Commercial National Bank Building at 316 Fourth Ave, brick and terracotta People's National Bank building[8] At the firm, Hannah is credited with The First Congregational Church (1904) on Dithridge Street near Forbes, a sandstone-fronted gray brick building that eventually became the St. Nicholas Greek Orthodox Cathedral.