The Scala Theatre was a theatre in Charlotte Street, London, off Tottenham Court Road. The first theatre on the site opened in 1772; the last was demolished in 1969, after a catastrophic fire. From 1865 to 1882, the theatre was known as the Prince of Wales's Theatre.

Sweethearts is a comic play billed as a "dramatic contrast" in two acts by W. S. Gilbert. The play tells a sentimental and ironic story of the differing recollections of a man and a woman about their last meeting together before being separated and reunited after 30 years.