The Rans S-21 Outbound is an American STOL homebuilt aircraft that was designed by Randy Schlitter and is produced by Rans Designs of Hays, Kansas. It was introduced at AirVenture in 2016. The aircraft is supplied as a quick-build kit for amateur construction or ready-to-fly.

Rans Designs, previously called Rans Inc., is an American aircraft and, formerly, a leading American recumbent bicycle and tricycle manufacturer, based in Hays, Kansas, United States. The company name is a portmanteau of the first and last names of the company founder, Randy Schlitter. Rans has produced over 3000 aircraft in kit form and as completed aircraft.