The comments follow the publication last week of the Government's strategy for special educational needs, Removing Barriers to Achievement.
The Independent Panel for Special Educational Needs described the strategy as "misleading and inadequate".
"It ignores the commonplace, chronic, deliberate law breaking on the part of local education authorities," said a spokesman.
The charity has written to the education secretary, Charles Clarke, to lodge formal complaints against five local authorities to illustrate unlawful practices, which it says are becoming increasingly common.
It is accusing the London Borough of Hackney of refusing to identify children who may need assessing, and of refusing to undertake assessment.
It also criticised East Sussex County Council's policy of not quantifying levels of support in statements of special needs.
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