Of these 55, 28 are from ruling BJP, 21 are from opposition Congress and three from the Bahujan Samaj Party.
The survey was conducted by the Madhya Pradesh unit of the NGO National Election Watch which scanned affidavits filed by 219 legislators in November 2008 election. Nine other MLAs had filed incomplete affidavits while two seats were vacant.
Citing the data, the NGO urged all political parties in Madhya Pradesh not to give tickets to persons facing criminal charges for the November 25 assembly election in the state.
The Congress had 69 out of 216 nominees facing criminal charges, the BJP 48 out of 217 and the BSP 41 out of 207.
The ministers against whom criminal cases are registered include Kailash Vijaywargia, Babulal Gaur, Ajay Vishnoi and Uma Shankar Gupta, it said.