Lilian Adelaide Neilson (3 March 1848 – 15 August 1880), born Elizabeth Ann Brown, was a British stage actress.

Neilson was the daughter of a strolling actress, Anne Brown, and was born, out of wedlock, at 35 St Peters Square Leeds in the West Riding of Yorkshire.

She married Philip Henry Lee, the son of a clergyman resident at Stoke Bruerne, Northamptonshire, on 30 November 1864 at St. Mary's Church, Newington, Surrey using the name Lilian Adelaide Lizon.

[5] In the spring of 1865, after having received some instruction from the veteran actor John Ryder,[6] she appeared at Sarah Thorne's Theatre Royal (Margate), long a training-school for novices, where she made a favourable impression.

By 1872 she was hugely popular and, after making a successful tour of British cities and giving a series of farewell performances in London, she came to America, where her agent was Edwin F. De Nyse.

[9] The American drama critic William Winter wrote that: "Her face just sufficiently unsymmetrical to be brimful of character [,...] the carriage of her body [...] like that of a pretty child in the unconscious fascination of infancy [...] and above all of these [...] was a voice of perfect music.

The parts that she acted in America included Juliet, Rosalind, Viola, Beatrice, Imogen and Isabella, from Shakespeare and Amy Robsart, Julia, Pauline and Lady Teazle, from other authors.

A subsequent post-mortem stated death was caused by blood loss due to a rupture in the broad ligament near the left fallopian tube.

[5] She is buried in Brompton Cemetery, London, where a sculptured cross of white marble bearing the inscription "Gifted and Beautiful—Resting" marks her grave.