Lilian Mary Watson (17 September 1857 – 27 May 1918) was an English female tennis player.

[2] In 1881 she reached the final of the Edgbaston Open where she lost in three sets to her sister Maud Watson.

In 1883 she reached the final of the Teignmouth and Shaldon Open that was played on asphalt courts, but was defeated by Florence Mardall two sets to one.

In the same year, she won the doubles title at the Irish Championships alongside her sister Maud.

In her final Wimbledon appearance in 1886 she reached the semifinals in which she was defeated by eventual champion Blanche Bingley.