Lillian Forrester (née Williamson; born 1879) was a British suffragette who led an attack on the Manchester Art Gallery.

In 1911 Forrester was invited to Eagle House near Bath by Linley and Emily Blathwayt.

[4] Forrester led an attack on the Manchester Art Gallery on 3 April 1913.

She, Evelyn Manesta and Annie Briggs waited until the gallery was closing and then proceeded to break the glass on many of the most valuable paintings.

The three attacked the glass of thirteen paintings including two by John Everett Millais and two by George Frederick Watts.