Gordon & Helliwell was a Canadian architectural firm based in Toronto, Ontario. The principals were Henry Bauld Gordon, RCA, (1854–1951) and Grant Helliwell (1855–1953).

Selected works Queen's Theological Hall, Kingston, Ontario, 1879 Queen's University Kingston, Ontario, Arts Building, Queen's University, 1879-80 Knox Church (interior), Toronto, Ontario, 1881 St. Andrew's Presbyterian Church, Brampton, Ontario, 1881 Upper Canada Bible and Tract Societies, Toronto, Ontario, 1886 Kilgour Brothers' Building, Toronto, Ontario, 1886 Bathurst Street Methodist Church, Toronto, Ontario, 1888 Parkdale Presbyterian Church, Toronto, Ontario, 1888 The Great Hall, Toronto, Ontario, 1889 St. Peter's Church (addition), Toronto, Ontario, 1890 Church of the Messiah, Toronto, Ontario, 1891 35 Rosedale Road, Toronto, Ontario, 1891 Church of the Messiah Rectory, Toronto, Ontario, 1892 Orillia Opera House (built as Orillia City Hall), Orillia, Ontario, 1895 Harris Henry Fudger House, Toronto, Ontario, 1897 40 Maple Avenue, Toronto, Ontario, 1898 Avenue Road Church, Toronto, Ontario, 1899 49 Elm Avenue, Toronto, Ontario, 1901 181 Crescent Road, Toronto, Ontario, 1902 St. Peter's Anglican Church Rectory, Toronto, Ontario, 1905 Oaklands (addition), Toronto, Ontario, 1906 Wycliffe College, Toronto, Dining Hall and Dormitory Wing, 1907; Principal's Residence and new Chapel, 1911. Church of the Epiphany, Toronto, Ontario, 1911 18 Elm Street, Toronto, Ontario, n.d.

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