Helen de Guerry Simpson (1 December 1897 – 14 October 1940) was an Australian novelist and British Liberal Party politician.

Her great-grandfather, Piers Simpson, R.N., was associated with Sir Thomas Mitchell and her maternal grandfather, the Marquis de Lauret, settled at Goulburn some 50 years before her birth.

It attracted little notice but was included by Percival Serle in his list of the more important volumes in his Bibliography of Australasian Poetry and Verse, published in 1925.

Her play, A Man of His Time, based on the life of Benvenuto Cellini and written partly in blank verse, was performed by McMahon's repertory company at Sydney and published there by Angus & Robertson in 1923.

She was a member of the Detection Club and contributed to two of their round-robin works The Floating Admiral (1931) and Ask a Policeman (1933) and the creative non-fiction The Anatomy of Murder (1936).

The three books have no connection with each other; in reality they form three separate short novels with the common basis that the most hateful things may be done for apparently the best of reasons.

She gave a series of lectures[3] and, while in Australia, collected material for the novel Under Capricorn, which appeared in 1937 and was set in Sydney about 100 years earlier.

[7] In 1939 she was selected by the Isle of Wight Liberal Association to be their parliamentary candidate at the UK General Election which was expected to take place in 1939 or 1940.