Susan Quilliam is a British relationship expert who specialises in love and sexuality.

[1] She works as an advice columnist, writer, broadcaster, consultant, trainer and coach.

[2] Quilliam has been the sex and relationship advice columnist for Fabulous magazine, a Sunday supplement of The Sun,[3] as well as resident psychologist answering patient questions for the Sexual Advice Association website.

[4] Quilliam came to attention in both the US and UK for her rewriting of the manual The Joy of Sex in 2008.

[5] Quilliam from 2008 to 2010, co-presented a weekly radio programme, Sex in the City with Jim Davis on LBC 97.3.