Katherine Patricia Mary Barber (born 1959) is a Canadian lexicographer and was previously Editor-in-Chief of the Canadian Oxford Dictionary.
Born in Ely, Cambridgeshire, England, she received a Bachelor of Arts degree from the University of Winnipeg in 1980, and a Master of Arts from the University of Ottawa in 1990.
From 1984 to 1991, she was a lecturer in the School of Translation and Interpretation at the University of Ottawa. From 1989 to 1991, she was a research associate with the Bilingual Canadian Dictionary project at the University of Ottawa. She was Editor-in-Chief of Canadian Dictionaries for the Oxford University Press in Canada from 1991 to 2008, when OUP closed the Canadian dictionary department. Since 2008 she has been sole proprietor of Tours en l'air Ballet Holidays, which organizes ballet-themed trips to North American and European destinations.