Olgiati (pronounced "ol-jotty") is an Italian and Swiss surname. Notable people with this name include:
Gerolamo Olgiati (1453–1477), government official in Milan Girolamo Olgiati, late Renaissance Italian engraver and printmaker Giuseppe Olgiati (1660–1736), Roman Catholic bishop P.R. Olgiati (1901–1989), American politician from Tennessee Rudolf Olgiati (1910–1995), Swiss architect Valerio Olgiati (born 1958), Swiss architect
See also Olgiati Bridge, bridge in Chattanooga, Tennessee, US, named after the politician