(Mary) Monica Bridges born Mary Monica Waterhouse (pseud) Matthew Barnes (31 August 1863 – 9 November 1949) was a British pianist, composer and collaborator with her husband the poet Robert Bridges.

Her mother, Elizabeth (born Hodgkin), taught her arts and crafts and she became a pianist and a composer.

[2] She was a skilled calligrapher and this book is credited with making italic handwriting fashionable in British schools.

[3] Monica and her husband both served on the committee[1] and they would jointly publish tracts under the shared pseudonym of Matthew Barnes.

The society aimed to have clarity in communication and they wrote about issues relating to the derivation of words and their usage.