Joseph Furttenbach the Elder (1591 – 1667) was a German architect, mathematician, engineer and diarist.
Joseph Furttenbach was born in Leutkirch, Germany on December 30, 1591. He began a nearly ten year stay in Italy around 1610. He studied engineering, military architecture and grew an interest in theatre and stage design while abroad. Through his travels he made detailed accounts of buildings that interested him as well as festivals, processions and dramatic performances. In three of his books he wrote expositions on scenery and lighting for the theatre. He is only second to Nicola Sabbatini as one of the most extensive accounts of backstage practices during the Renaissance.
After his stay in Italy, he moved back to Germany and settled in Ulm. There, he had a successful career as an architect and universal engineer. He designs included a hospital, a waterworks system, a schoolhouse, a theatre, and homes. He was eventually named city architect of Ulm, wrote many books, and served on the city council.