This chapter is about some aspects of discrimination in nationality law: against women, against men and against those born to parents not married to each other, and about the attempts of both legislatures and courts to address these. It examines such attempts and from them draws conclusions about what has been achieved to date. It surveys where there remains work to be done. The chapter includes detailed legislative commentary and draws on cases from both the UK and Canada, on parliamentary debates and on the author’s first-hand experience of the passage of UK legislation since 2002.