Leading nurses have said that staff were "regularly being fined for being at work".
A number of organisation were unable to provide information as they had third-party providers dealing with their parking fines.
Others have said they did not differentiate between staff, patients or visitor fines.
The Royal College of Nursing (RCN) has appealed to the Government to make sure staff have "safe and cost-effective parking or travel means".
RCN England Executive Director Patricia Marquis told Channel 4: "It's really shocking to see it laid out like that".