Sylvana Palma Windsor, Countess of St Andrews (née Tomaselli, previously Jones; born 28 May 1957) is a Canadian-born academic and historian.

By virtue of marriage she is a member of the House of Windsor and is related to the British royal family as the wife of George Windsor, Earl of St Andrews, eldest son of Prince Edward, Duke of Kent, second cousin of King Charles III.

Two of her children, Edward (2003) and Marina (2008), were received into the Roman Catholic Church, thereby surrendering their places in the line of succession to the thrones of the Commonwealth realms, although Lord and Lady St Andrews' younger daughter, Amelia, is Protestant and is still in remainder to the British Crown.

She is the translator of Book II of the Seminar of Jacques Lacan, The Ego in Freud's Theory and in the Technique of Psychoanalysis.

[1] She is a founding member of the European Centre for the Philosophy of Gender, Siegen, Germany,[8] and is currently Director of Studies in History and Social & Political Sciences at St John's College in the University of Cambridge, and a tutor for postgraduates.