Old St Paul's may refer to:
United Kingdom
Old St Paul's Cathedral in London, England, destroyed in 1666
Old St. Paul's (novel), a novel by William Harrison Ainsworth set in the cathedral Old St. Paul's (film), a 1914 British silent historical film based on the novel Old Saint Paul's, Edinburgh, a Scottish Episcopal Church church in Scotland Old St Paul's Church, Hoddlesden, a former church in Lancashire, England
North America
St. Paul's Episcopal Church (Baltimore, Maryland) or Old St. Paul's Church, an Episcopal church Old Saint Paul's Cemetery, the associated cemetery Old St. Paul's Methodist Episcopal Church, a former church in Odessa, Delaware
Oceania
Old St. Paul's, Wellington, a former cathedral in New Zealand
Old St Paul's Anglican Church, Deniliquin, a former church in New South Wales, Australia