Joyce Watson FNZIC (5 July 1918 – 28 September 2004) was a New Zealand chemist specialising in fruit disorders and trace elements.

[2] After a BSc in 1939, Watson completed an MSc titled A phase rule investigation of the three component system BaO–(CH3CO)2O–H2O at 25°C and 35°C in 1940 at Canterbury College, then part of the University of New Zealand.

[2] Watson's research began with investigating the disorders of fruit caused by trace element deficiencies, and progressed into tomatoes, pasture, hops, flax and tobacco.

[2][4] Watson's work on the fruit disorder bitter pit led to the discovery that the cause is calcium deficiency.

[2] When takahē were rediscovered in 1948, Watson was tasked by the Wildlife Service with analysing the tussock to assist with captive rearing and to discover whether the application of fertiliser might improve bird health.