The Office of Theresa May was established in 2019 to facilitate Theresa’s ongoing involvement in public life and to support her philanthropic work.

Theresa speaks regularly in the UK and around the world on a range of local, national and international issues. She takes a particular interest in matters concerning the global economy and trade, international relations, UK foreign policy, national security, the environment and the Union of the United Kingdom. She also speaks regularly about the eradication of modern slavery, domestic abuse and the social injustices she has helped address throughout her political career. In 2023 she established the Global Commission on Modern Slavery and Human Trafficking.

Theresa works with over 20 charitable and voluntary organisations, including JDRF, the type 1 diabetes charity; the National Rheumatoid Arthritis Society; Alexander Devine, the children's hospice service; the Aldersgate Group, a business organisation which champions environmental sustainability; the Anti-Slavery Collective and a range of other organisations, including those supporting action on domestic abuse and mental health issues.

Theresa undertakes some paid speaking engagements to support her philanthropic and campaigning work.