The 1984 NatWest Trophy was an English limited overs county cricket tournament which was held between 4 July and 1 September 1984.
[1] The fourth NatWest Trophy tournament, it was won by Middlesex who defeated Kent by 4 wickets in the final at Lord's.
The seventeen first-class counties were joined by thirteen Minor Counties: Berkshire, Buckinghamshire, Cumberland, Devon, Durham, Hertfordshire, Norfolk, Northumberland, Oxfordshire, Shropshire, Staffordshire, Suffolk and Wiltshire.
The Ireland and Scotland teams also participated.
The winners in the second round then progressed to the quarter-final stage.