Sir Roderick Bignell Weir JP (14 July 1927 – 15 November 2021) was a New Zealand businessman.

In 1963, he set up his own stock and station agency branded as Rod Weir & Co. After the merger with other agencies, Crown Corp was formed and eventually, the company purchased the New Zealand interests of Dalgety NZ Ltd. Weir retired from this company as chief executive in 1985.

He was a trustee of the New Zealand Institute of Economic Research, Medic Alert, and Wanganui Boys' College.

[6] Weir was appointed a Knight Bachelor, for services to farming, commerce, and the community, in the 1984 Queen's Birthday Honours.

[8] In 2008, he was inducted into the New Zealand Business Hall of Fame for "stock and station leadership"; he was the 100th laureate.