Cathy Gilliat-Smith (born 19 March 1981, also known as Cath Nicholson) is an English international field hockey player who played as a forward for England and Great Britain, achieving 64 international caps.

She is Head of Hockey, runs the girls' athletics programme,[3] teaches PE and design, and is assistant to the Housemaster of Johnsons House as well as tutoring the Middle School boys of Johnsons.

Gilliat-Smith was selected for the England Women's U21 squad to play in the Junior Nations Cup in 2002 European Junior (Women) Nations Cup in Jaen, Spain and was a member of the England U21 squad that toured South Africa in early 2001.

With the England team at the Eurohockey Nations Championships she twice won bronze medals – in Dublin in 2005 and in Manchester in 2007.

In 2020 Gilliat-Smith made her Stoolball debut for Weald, scoring 95 runs.