(November 24, 1884 – October 1, 1957) was an American architect and architectural lecturer active in early- to mid-twentieth-century Indianapolis, Indiana.
A member of the American Institute of Architects, he was partner in the firms of Vonnegut & Bohn, Vonnegut, Bohn & Mueller, and Vonnegut, Wright, and Yeager.
He designed several churches, banks, and became the in-house architect for Indiana Bell and Hooks Drug stores (prior to World War II), practicing extensively in the Art Deco style.
He was the father of chemist Bernard Vonnegut and author Kurt Vonnegut Jr.