Ada Hannah Lewis-Hill born (26 April 1844–13 October 1906) was an English amateur musician and philanthropist.

[3] She was brought up in Dublin, where she married the financier and philanthropist Samuel Lewis in 1867, and lived with him in Grosvenor Square until his death in 1901.

On 13 July 1904, Ada Lewis married William James Montagu Lewis-Hill,[3] "a noted Jewish moneylender to the aristocracy".

[5] Lewis-Hill died of cancer on 13 October 1906 and was buried in Hoop Lane Jewish Cemetery in Golders Green, London, together with Samuel.

[3] Upon her death, she endowed the Royal Academy of Music with fifteen scholarships at a cost of nearly £20,000 and generous yearly subscriptions.