HMS Speaker (D90), a Ruler-class escort carrier, based on a "C3" hull, was originally the Bogue-class USS Delgada (AVG/ACV/CVE-40), which was transferred to the United Kingdom under the Lend-Lease program.

The Ruler-class of escort aircraft carriers served with the Royal Navy during the Second World War. All twenty-three ships were built by the Seattle-Tacoma Shipbuilding Corporation in the United States as Bogue-class escort carriers, supplied under Lend-Lease to the United Kingdom. They were the most numerous single class of aircraft carriers in service with the Royal Navy.