Trond Eliassen (born 10 October 1922) is a Norwegian architect.
He was born in Kristiania to architect Georg Eliassen and artist Helfrid Beda Andrea Strömberg, and is a brother of metrologist Arnt Eliassen. In 1947 he started an architectural company jointly with Birger Lambertz-Nilssen. Their designs include the county hospitals of Vest-Agder, Aust-Agder and Telemark, the Sandefjord town hall, and the Norwegian Maritime Museum. Eliassen was decorated Knight, First Class of the Order of St. Olav in 1983.