Lucy Knox (9 November 1845 – 10 May 1884), styled The Honourable from 1870 until her death, was an Anglo-Irish poet of the Victorian era.
Knox's first collection of poetry, Sonnets and Other Poems was published privately in London in 1870.
In 1877 Knox contributed several poems to the Irish Monthly alongside her father and cousin, Aubrey Thomas de Vere.
A review in The Academy expressed admiration for Knox's genuineness and merit.
Their grandson was the British judge Sir John Leonard Knox.