Costello Chapel, Catholic chapel in Carrick-on-Shannon, Ireland.

Costello Chapel is a small Catholic chapel in Carrick-on-Shannon containing a marble altar facing a single stained glass window, with decorated tile panels surrounding the burial sites. The entrance on Bridge Street is marked by two stone pillars topped with Celtic crosses.

Edward Costello built the chapel in 1879 as a memorial to his wife Mary Josephine, who is buried inside it alongside him. Measuring 16 feet by 12 feet, it is thought to be one of the world's smallest churches.

The chapel reflects an Irish tradition of the 1800s in which personal loss found expression through religious building and careful craftsmanship. The decorated tile work and visible burial sites show how devotion shaped the space's appearance and purpose.

The chapel sits on Bridge Street in Carrick-on-Shannon and is easy to spot thanks to the stone pillars with Celtic crosses marking its entrance. Visitors should approach with respect since this remains a private memorial space dedicated to personal remembrance.

At 16 feet by 12 feet, the chapel is thought to be one of the smallest churches in the world. Edward Costello built it in 1879 as a memorial to his wife Mary Josephine, and both are buried inside the chapel.