A chip butty, chip sandwich, chip barm, chip batch, chip roll, chip muffin, piece an chips or chip piece (in Scots) is a sandwich made with bread or a bread roll (usually white and buttered) and chips, often with some sort of sauce such as tomato sauce (i.e. ketchup) or brown sauce. The word butty is a contraction of "bread and butter" that came from northern England, perhaps Yorkshire or Liverpool.
The chip butty was originally considered a working-class meal and was served in pubs. Usually a meal is served with a round of bread so diners can assemble their own chip butty with leftover chips. The chip butty can be vegetarian-friendly if the chips are not fried in lard or dripping. One variation is the chip bap or barm, which uses a floury bap or barm cake instead of white sliced bread. Another variation frequently seen in the North is the scallop butty, in which a battered slice of potato is used in place of chips. In the East Midlands a chip butty made with a bread roll is referred to as a "chip cob".