The Lloyds TSB Foundation for England and Wales has launched a new funding initiative aimed at supporting work that improves the lives of people with mental illness in the criminal justice system.
The grants will last for up to three years, and their value will be decided according to the needs of the charities that apply, a spokeswoman said.
A budget for the initiative won't be set until the foundation has received funding applications from interested charities, she added.
The foundation would particularly like to receive applications that are new or innovative and push existing boundaries, will extend or replicate an existing and proven model of working, and will improve joined-up working with statutory agencies to deliver better services.
Linda Kelly, chief executive of the foundation, said: "The foundation has a long history of supporting charities working within the criminal justice system. We hope this funding stream will provide much-needed support and funds in this key area of work."
Charities that are interested in applying for grants can apply through the foundation's website and need to fill out a short form to express their interest by 3 November.