Kellogg's Special K Biscuit Moments Cioccolato packs sold through 240 stores based across northern England and The Midlands have been recalled because they are in Italian.
The boxes containing five 25g bars are not in English and do not warn shoppers they contain soya, milk and wheat which may pose a risk to allergy sufferers.
The food watchdog warned people not to eat the bars but return them for a full refund.
The boxes with the best before dates 9 July 2016 and 14 July 2016 are sold by Hull-based Heron Foods.
No other Kellogg's products are known to be affected.
The firm said: "As a precautionary measure Heron Foods is recalling the Kelloggs Special K Biscuit Moments Cioccolato due to Soya, Milk and Wheat not being declared in English.
"If you have purchased this product and are allergic to Soya, Milk or Wheat, do not eat this product. Instead, return it to your local Heron Foods/ Cool Trader store for a full refund.
"We are very sorry for any inconvenience caused. Any customers with queries or concerns can contact Heron Foods on 0845 6037300 or email firstname.lastname@example.org."
The Food Standards Agency said: "The above product contains wheat (gluten), milk and soya which are not mentioned on the label in English.
"This means the product is a health risk to anyone with an allergy or intolerance to wheat (gluten), milk or soya.
"If you have bought the above product and have an allergy or intolerance to wheat (gluten), milk or soya do not eat it. Instead return it to the store from where you bought it for a full refund."