Merrill Auditorium is a 1,900-seat auditorium located in Portland, Maine, United States. Originally known as Portland City Hall Auditorium, it is located in the eastern section of Portland City Hall. Organizations such as Portland Ovations and the Portland Symphony Orchestra use the auditorium as a primary performance space. PortTIX is the official box office of the Merrill Auditorium.The auditorium was built in 1911 and underwent a major rebuild and renovation in 1997. It features a large pipe organ, the Hermann Kotzschmar Memorial Organ, donated by Cyrus Curtis and built by the Austin Organ Company (Opus 323).