Diwan (pronounced [ˈdiwɑ̃n], seed in Breton) is a federation of Breton language-medium schools in Brittany (France).

The Diwan concept, which allows children to learn French and Breton through immersion was inspired by the Gaelscoileanna movement in Ireland, Ikastolak movement in the Basque Country and the Mudiad Ysgolion Meithrin movement in Wales however as Diwan educates up to age 18 its schools are more like Welsh medium education schools in Wales.

From ages 2–6, Breton is the sole language of instruction. At the age of 7 and a half, French is introduced during 2 out of 26 school hours. When the students are 10, French (6 hours out of 23) is taught at the same level as Breton. This remains the same when they reach middle school, but English and a choice of Spanish or German are taught in addition.

The first Diwan school was created by a few parents in 1977 at Lampaul-Ploudalmézeau (Breton: Lambaol-Gwitalmeze) near Brest, because the centralized French state schools were unwilling to offer the Breton language in the curriculum. The initial nursery school was followed by the first primary school in 1980, the first collège in 1988 and the first lycée in 1994.

Dewan, Diwan or Divan may refer to:

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A school is an institution designed for the teaching of students (or "pupils") under the direction of teachers. Most countries have systems of formal education, which is commonly compulsory. In these systems, students progress through a series of schools. The names for these schools vary by country (discussed in the Regional section below), but generally include primary school for young children and secondary school for teenagers who have completed primary education. An institution where higher education is taught, is commonly called a university college or university.

In addition to these core schools, students in a given country may also attend schools before and after primary and secondary education. Kindergarten or pre-school provide some schooling to very young children (typically ages 3–5). University, vocational school, college or seminary may be available after secondary school. A school may also be dedicated to one particular field, such as a school of economics or a school of dance. Alternative schools may provide nontraditional curriculum and methods.