Cuts in local government funding will see charities and voluntary groups lose out on more than £100m, campaigners have warned.
Anti-cuts website False Economy said thousands of charities were likely to suffer, including those providing "vital services" for elderly or vulnerable people.
The group's study of local councils indicates that some charities will have their funding axed altogether.
More than £10m in cuts have been made during the last 12 months, but False Economy estimates that the final figure will rise much higher once authorities have finalised their plans.
Campaign director Clifford Singer said the cuts would go deep into the voluntary and community sectors – affecting groups which help disabled people, children, the elderly and vulnerable adults.
Mr Singer said: "These are not just nice to have groups but organisations providing vital services for older people trying to maintain independent lives, vulnerable children and abused women.
"With so many of the cuts simply resulting in further pressure on the NHS or other statutory services, they are truly a false economy."
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