The Messerschmitt P.1099 was a two-seat prototype jet plane designed by Messerschmitt for the Luftwaffe before the end of the Second World War.
The design of the Me P.1099 was begun in the summer of 1943 and was intended as an improvement to the Messerschmitt Me 262. The Me P.1099 was planned in a way which could later be developed into high-speed bomber (Schnellbomber), reconnaissance plane, interceptor, night fighter and trainer versions.
The Messerschmitt P.1099 was a 12 m long, conventional-looking aircraft with a wingspan of 12.6 m. It had a wider fuselage than the Messerschmitt Me 262 and was equipped with a cockpit for two pilots, located at the front end. The planned powerplants were two Junkers Jumo 004 turbojet engines, later to be replaced by Heinkel HeS 011 turbojets in a further development with swept wings, the Messerschmitt P.1100. None of the variants were built, but this project was developed into the Messerschmitt P.1100 all-weather fighter project, which in turn would lead to the single-seat, single-jet Messerschmitt P.1101 design for the Emergency Fighter Program in July 1944.