Margaret Henrietta Augusta Casely-Hayford CBE is a British lawyer, businesswoman and public figure who is active in the voluntary sector. She is Chancellor of Coventry University, chairs the board of trustees of Shakespeare's Globe, and was formerly chair of ActionAid UK and company secretary and head of legal services for leading retailers the John Lewis Partnership. She is in the forefront of working to create diversity on boards.

She was chosen to chair of the diversity review conducted by CILIP in 2017 into the awarding of the Carnegie and Kate Greenaway Medals. Committed to encouraging all business leaders to promote diversity on boards, she has said: "That is the future. There is a whole slew of people who still feel that they aren't part of the game. We are a mixed society – that's what Britain has been for so long. We just need to be more positive rather than negative, and showcase it. We are now at a crossroads." Additionally, she is the former mentor of rap artist and media entrepreneur Kelvyn Colt.

In July 2017 Casely-Hayford was named the new Chancellor of Coventry University, the first woman to hold the position. In February 2018, she was announced as the new chair of the board of Shakespeare's Globe, taking over the appointment from Michael Bichard.