Pesawat sederhana adalah alat mekanis yang mengubah arah atau besaran suatu gaya.<ref>{{cite book|last=Paul|first=Akshoy|year=2005|url=http://www.mtsu.edu/~pdlee/public2_html/simple_machines.html#sm#5|title=Mechanical Sciences:Engineering Mechanics and Strength of Materials|publisher=Prentice Hall of India|isbn=8120326113|page=215|coauthors=Pijush Roy, Sanchayan Mukherjee|access-date=2020-09-12|archive-date=2008-04-20|archive-url=https://web.archive.org/web/20080420114434/http://www.mtsu.edu/~pdlee/public2_html/simple_machines.html#sm|dead-url=yes}}</ref> Secara umum, pesawat sederhana merupakan mekanisme paling sederhana yang menggunakan keuntungan mekanis untuk menggandakan gaya.<ref name="Asimov">{{cite book|last=Asimov|first=Isaac|year=1988|url=http://books.google.com/books?id=pSKvaLV6zkcC&pg=PA88&dq=Asimov+simple+machine&cd=1#v=onepage&q&f=false|title=Understanding Physics|location=New York|publisher=Barnes & Noble|isbn=0880292512|page=88}}</ref> Menurut ilmuwan pada [[abad Renaisans]] ada enam pesawat sederhana tradisional, yaitu:<ref>{{Cite web|title=The Simple Machines, the building blocks.|url=http://www.machine-information-systems.com/Simple_Machines.html|website=www.machine-information-systems.com|access-date=2020-09-12}}</ref><ref>{{Cite web|date=2019-09-10|title=Simple machines|url=https://berezuma.com/dbh3/mekanismoak-dbh3/simple-machines/|website=Berezuma.com|language=eu|access-date=2020-09-12}}</ref>
