The Blériot-SPAD S.20 (originally known as the SPAD S.XX) was a French fighter aircraft developed near the end of World War I.

Too late to serve in the war, almost 100 of these aircraft equipped the French Air Force in the years immediately following.

Originally the French government issued an open-ended contract for these aircraft at the rate of 300 per month.

The order was later revived to obtain a modern fighter for France's post-war air force, and 95 were purchased.

This was the beginning of a prodigious streak of records set by a series of refined S.20s with increasingly shorter wingspans.