Frederick de St. Croix Brecken KC (9 December 1828 – 14 October 1903) was a lawyer and political figure in Prince Edward Island.
He represented Charlottetown in the Legislative Assembly of Prince Edward Island from 1873 to 1876 and Queen's County in the House of Commons of Canada from 1878 to 1882 and from 1883 to 1884 as a Conservative member.
He was born in Charlottetown, the son of John Brecken and Margaret Leah de St. Croix.
He was educated in Charlottetown and then articled in law with Robert Hodgson, continuing his studied at Lincoln's Inn and the Inner Temple in London.
When that post became elective in 1863, he ran successfully for a seat in the island's assembly and served in the Executive Council as Attorney General from 1870 to 1872 and 1873 to 1876.