The Ferdinand Tönnies Society (Ferdinand-Tönnies-Gesellschaft e. V., FTG) was founded in 1956 in Kiel, Germany.
The society publishes an edition of Tönnies' complete works which has been reconstructed using the "textual criticism" technique (Ferdinand Tönnies Gesamtausgabe, 24 vols., edited by Lars Clausen ( -2010), Alexander Deichsel, Cornelius Bickel, Rolf Fechner ( -2006,), Dieter Haselbach, Carsten Schlüter-Knauer, and Uwe Carstens (2006–2020); Berlin and New York, Walter de Gruyter 1998- ).
The FTG also publishes the bi-annual Tönnies-Forum magazine.
Furthermore, the FTG owns the Ferdinand-Tönnies-Haus (a student residence) in Kiel and organizes as well public lectures on academic and political topics for the public.
President is at present [since 2020] Dieter Haselbach.