The parish church of St Mungo was established in the 14th century then enlarged and the tower raised in 1680-2. The mason was Tobias Bauchop, whose house still stands in Kirkgate. Around 1700, John, 6th Earl of Mar, built a private aisle with burial vault on the north side of the church. The old kirk became overcrowded and was condemned in 1816: it was mostly demolished and many stones reused to build the new parish church in Bedford Place.

Designed by James Gillespie Graham, the Mar & Kellie Mausoleum was built on the site of the Mar Aisle. The original ceiling was painted brightly and decorated with flowers and Rococo panels. It was partly restored in 1994-6.

The old kirkyard contains a good collection of early trade gravestones and fine memorials for many of the people responsible for the development of Alloa into a busy industrial town.