Saasen (/ˈsɑːzən/; German: [ˈsaːzən]) is a village in the municipality of Reiskirchen in Central Hesse, Germany.

Next to the church, in the former schoolhouse in the years 1734-1785, lived the "man of the calendar Veitsberg", the mathematically and scientifically versed Jacob Conrad Justus.

The village square of Saasen was established on the eastern bank of the Wieseck on a ridge of land backed by a steep hill.

The site is located east of the main town in the valley on the Busecker tal and at the Wieseck in central Hesse.

The village has been expanding in size quite considerably in recent years, with a population estimate of 1,200 in 2006, up over 60 from the census in 2001.