Course-focused and comprehensive, the Textbook on series provides an accessible overview of the key areas on the law curriculum. This chapter examines theories on female offending, which include biological, hormonal, and psychological theories; learning theories; masculinity/femininity theories; strain theories; and control theories. Traditional mainstream criminology views male criminality as ‘normal’ and something that merely needs to be kept within reasonable bounds. Female criminality is, however, abnormal, unexpected, and portrayed as pathological and irrational. It is argued that mainstream criminology fails to use social explanations of criminality to explain why women offend or are more conforming than their male counterparts. The most promising ideas so far come from control theories and strain theories, so long as these are applied in a gender-neutral manner.