Janet Andrewartha (16 September 1951 – 26 July 2024) was an Australian television and theatre actress and director and singer.

Andrewartha's most significant roles were in Australian television series, most prominently Rebecca "Reb" Kean in Prisoner and Lyn Scully in the soap opera Neighbours.

Andrewartha took a part-time drama course and after one year decided to quit teaching to pursue acting full-time.

She acted in Barry Dickins' Reservoir by Night and in Shirley Gee's Never in My Lifetime opposite Kevin Harrington.

[11] Andrewartha continued working with the Melbourne Theatre Company on several productions, including a role in the Australian outing of Tom & Viv.

[6] For her portrayal of the role, Andrewartha won a leading actress accolade the 1987 Green Room Awards.

[13][14][15][16][17] Despite her success, Andrewartha was not asked to return for the show's last series and she resumed her work with the Melbourne Theatre Company.

[16] In 1991, she played Sandra in another Melbourne Theatre Company production, Sunday Lunch; she also took the lead role of investigative journalist Jean in Michael Gurr's Sex Diary of an Infidel.

[39][40] Andrewartha died in her sleep in Melbourne, Australia on 26 July 2024 at the age of 72, within three months of receiving a cancer diagnosis.

[42] Stefan Dennis, Jason Herbison, Holly Valance, Carla Bonner also paid tribute as well as casting director Jan Russ, Jane Hall and Lucinda Cowden.