The CASE Insights on Philanthropy (United Kingdom and Ireland), formerly the CASE-Ross Support of Education survey, was first carried out in 2002 (for 2001-02 data) and built on previous surveys undertaken within the Ross Group. The survey has been conducted annually since then. The survey for CASE Insights on Philanthropy (United Kingdom and Ireland), 2023-24, was open to participants from 8 November to 13 December 2024. Invitations to participate were sent to 161 higher education and specialist institutions in the United Kingdom alone that are involved in some form of fundraising or alumni relations activity. Seventy-eight (78) institutions across the United Kingdom participated, yielding a response rate of 48.4%. Four higher education institutions from Ireland and the Institute of Cancer Research in the United Kingdom also took part in the survey, for a total of 83 institutions across the United Kingdom and Ireland that participated for 2023-24. Participating institutions provided data for the 12-month period between 1 August 2023, and 31 July 2024. Data have not been reweighted to estimate funds raised and other data for non-participating institutions, so reported totals only account for a portion of the total philanthropic support for higher education in the United Kingdom and Ireland. This report provides key findings on new funds committed, funds received, alumni and donor numbers, advancement investment, and FTE advancement staff. These measures provide a broad indication of the return on investment and economic impact of fundraising across institutions in the United Kingdom and Ireland.