Robert Macfarlane Cameron was a prominent Canadian architect known for his contributions to modern architecture, particularly in the mid-20th century. Here are some notable architectural works designed by him:

1. The Toronto-Dominion Centre (1967) - Located in Toronto, this complex is one of the largest office developments in Canada and is known for its modernist design and integration into the urban fabric of downtown Toronto.

2. The Ontario Science Centre (1969) - This science museum in Toronto features a unique architectural style that emphasizes interaction with the environment and innovative use of space.

3. The Royal Ontario Museum (Renovation, 1984) - Cameron was involved in the renovation of this iconic museum, which included the addition of the Michael Lee-Chin Crystal, a striking modern extension that contrasts with the original building.

4. The Toronto City Hall (1965) - While not the primary architect, Cameron contributed to the design and planning of this landmark building, which is known for its distinctive curved forms and innovative use of space.

5. The Canadian Broadcasting Corporation (CBC) Building (1976) - Located in Toronto, this building is notable for its modernist design and serves as a key facility for the national broadcaster.

6. The University of Toronto Scarborough Campus (1973) - Cameron played a significant role in the design of this campus, which is known for its integration with the natural landscape and modern educational facilities.

Cameron's work is characterized by a modernist approach that often incorporates elements of the surrounding environment, making his buildings both functional and aesthetically pleasing. His contributions have had a lasting impact on the architectural landscape of Canada.