Crisis is the UK national charity for people experiencing homelessness. The charity offers year-round education, employment, housing and well-being services from centres in East London, Newcastle, Oxford, Edinburgh, South Wales, Croydon, Brent and Merseyside, called Crisis Skylight Centres.

As well as year-round services the charity runs Crisis at Christmas, which since 1972 has been offering food, warmth, companionship and support services to homeless people over the Christmas period. In 2016 almost 4,600 homeless people visited Crisis at Christmas.

Since its inception Crisis has been a campaigning organisation, lobbying government for political change that prevents and mitigates homelessness based on research commissioned and undertaken by the organisation.

Matt Downie OBE has been the chief executive of Crisis since 2022.

According to Crisis, the charity was "founded in 1967 in response to the shocking Ken Loach film Cathy Come Home shown the previous year, and a publicity campaign led by reforming Conservatives William Shearman and Ian Macleod highlighting the plight of homeless people". The drama-documentary Cathy Come Home was first broadcast by the BBC the previous November.

Since the 1960s Crisis has evolved to meet the changing needs of single homeless people, campaigning for change and delivering services to help people find a route out of their homelessness across the UK.

It was one of the seven charities nominated by Prince Harry and Meghan Markle to receive donations in lieu of wedding presents when the couple married on 19 May 2018.

There are 67 Skylight Centres covering East London (Aldgate), Brent, Croydon, Oxford, Merseyside, South Wales, Newcastle, Edinburgh and Birmingham. Crisis Skylight Centres are accredited education, training and employment centres, offering practical and creative workshops in supportive and inspiring environments, together with formal learning opportunities that lead to qualifications and finding work.