Knowlton Nash OC (born November 18, 1927, Toronto, Ontario) was the former and long-serving senior anchor of the Canadian Broadcasting Corporation's flagship news program, "The National."

Nash began his career working for The Globe and Mail in the 1940s before becoming an editor with British United Press in Canada. He moved to the United States where he worked as the information officer for the International Federation of Agricultural Producers. In the 1960s, he returned to journalism first as a freelance reporter and then as the CBC's Washington, D.C. correspondent and covered stories for the CBC such as the Cuban missile crisis and the assassination of John F. Kennedy. He then joined the CBC's management as head of news and information programming in 1968. Following the departure of Peter Kent as the National's anchor in 1978. During his tenure, the program expanded from 15 minutes to the first segment of an hourlong news package with "The National" being followed by "The Journal" which featured interviews and documentaries. In 1988, Nash offered to retire from his duties at "The National" in order to keep Peter Mansbridge from accepting an offer to host the morning news at the American network CBS. Nash left his position as CBC news' senior anchor and chief correspondent in 1988, yet remains active in Canadian journalism circles. He hosted various programs on CBC Newsworld in the 1990s.

In 1988 he was made an Officer of the Order of Canada.

Since his retirement he has written a number of books, including a history of the CBC.

See also: List of Canadians