The Sheffield City Battalion was a 'Pals battalion' formed as part of 'Kitchener's Army' during World War I. Raised by local initiative in the City of Sheffield, it became the 12th (Service) Battalion of the local York and Lancaster Regiment. After almost two years of training, it was virtually destroyed on the first day of the Battle of the Somme in a disastrous attack on the village of Serre. The battalion continued to serve on the Western Front, including the Arras offensive, but it was disbanded early in 1918.

The Pals battalions of World War I were specially constituted battalions of the British Army comprising men who had enlisted together in local recruiting drives, with the promise that they would be able to serve alongside their friends, neighbours and colleagues, rather than being arbitrarily allocated to battalions.