Hubert Bruce Day (8 December 1927 - 5 December 2015) was an Australian structural engineer, who undertook bridge design works for the MMBW and CRB in Melbourne, Australia from the 1950s to 1980s. Bruce Day was the principal design engineer for the bridge over Punt Road on the South Eastern Freeway, the first major metropolitan freeway in Melbourne. He also designed the elevated roadway section of stage two of the freeway over the Yarra River and Gardiners Creek. Day was involved in the investigation of the causes of the partial collapse of the Kings Way Bridge, for which he designed post tensioning strengthening. He also designed bridges for St Kilda Junction, which included grade separation of major roads and tram bridges. in the mid 1970s, he designed the bridges for the Eastern Freeway