Food labeling has the function of providing information facilitating the decision-making power of the consumer on whether or not the food is consumed. Labeling of processed fish was observed in the supermarkets of the municipality of Castanhal-PA. A checklist based on Normative Instruction No. 22 of November 24, 2005 was applied for the evaluation of product labels. Two evaluations were carried out: first comparing the establishments with the mandatory items in the current legislation and the second, compared the labels of eight fish Products, including canned goods, where the labeling had the highest number of mandatory information. The best result was observed in supermarket "L" with averages of 6.5 points of adequacy to the legislation, the lowest values are attributed to the "I" supermarket with an average of 4.45. The absence of items 1, 3, 4, 5, 8, 9 of the checklist, which correspond to the name of the product, the name and address, the registration number of the competent authority, lot identification, conservation and defrosting respectively. Ineligible labels have been found or even in handwritten form. Packing date and expiration date information was contained on most packages, with the exception of frozen piramutaba fillet, batch identification, was not contained on the labels of various products, except for salmon fillet and canned.