Cecil Chetwynd Kerr, Marchioness of Lothian (née Lady Cecil Chetwynd-Talbot; 17 April 1808 – 13 May 1877) was a British noblewoman and philanthropist who founded the Anglican Saint John's Church in Jedburgh and the Catholic Saint David's Church in Dalkeith.

[1] She took an increasing interest in the religious Oxford Movement who argued that Anglicanism needed to reintroduce aspects of Catholicism into their high church practices.

[3] The followers were known as Tractarianists and her spiritual advisor John Henry Newman was a leading thinker in the group.

Two years later Newman became a Catholic and in 1851 Kerr under Henry Edward Manning's instruction also converted to Catholicism.

[1] Kerr's good works continued when she was in London where she was friends with the writer Lady Georgiana Fullerton[4] and Margaret, countess of Newburgh who were both aristocratic Catholic converts.