During the 2010-11 school year, there were a total of 47 students attending classes in Siselen. There was one kindergarten class with a total of 11 students in the municipality. Of the kindergarten students, 27.3% were permanent or temporary residents of Switzerland (not citizens) and 18.2% have a different mother language than the classroom language. The municipality had 2 primary classes and 36 students. Of the primary students, 22.2% were permanent or temporary residents of Switzerland (not citizens) and 16.7% have a different mother language than the classroom language.