Eunice Kate Watts (née Nowlan; c. 1848 – 25 February 1924[1][2]) was a British secularist and feminist writer and lecturer.

She was one of the most prominent women active in the British freethought movement in the nineteenth and early twentieth centuries.

She was born in London to William and Eunice Nowlan, a freethinking family.

[6] Watts rose to prominence for her opposition to then NSS President & Founder Charles Bradlaugh's involvement in the Knowlton Trial, and was one of the founding members of the British Secular Union, the rival to Bradlaugh's NSS.

In 1877 she wrote Reply to Mr Bradlaugh outlining her opposition, which centred on the internal politics of the secular movement and her desire to disassociate secularism with "sexual immorality" of the Owenite movement.