===
Jach=== (Franciszek Jach) •
Jach Bimbuś (Bimbo) No.3 – Second Polish Glider Contest 17 May – 15 June 1925 •
Jach Żabuś (Froggy) – First Polish Glider Contest August 1923 •
Jach Żabuś 2 (Froggy 2) No.4 – Second Polish Glider Contest 17 May – 15 June 1925 ===
Janka=== (Zoltán Janka) •
Janka Gyöngyös 33 •
Janka Kócsag •
Janka-Rotter Vándor (Zoltán Janka – Lajos Rotter / MOVERO workshop, Gyöngyös) ===
Jansson-Thor=== (Bengt Jansson & Hank Thor) •
Jansson-Thor BJ-1B Duster •
Jansson-Thor BJ-1 Dyna Mite ===
Japanese Imperial Army Gliders=== •
Ku-5 •
Ku-9 •
Ku-10 •
Ku-12 •
Ku-14 ===
Janowski=== (Jaroslaw Janowski) •
Janowsky J-5 Marco – •
Janowsky J-6 Fregata ===
Jasiński-Czarnecki Czajka=== (Jasiński & Czarnecki) •
Jasiński & Czarnecki Czajka (Lapwing) No.15 – Second Polish Glider Contest 17 May – 15 June 1925 ===
Jastreb === (
Jastreb Fabrika Aviona i Jedrilica – Jastreb Aeroplane and Glider Factory) •
Jastreb Cirrus 17-VTC •
Jastreb Cirrus 75-VTC •
Jastreb Cirrus G/81 •
Jastreb Kosava-2-S •
Jastreb Vuk-T (Tomislav Dragović) •
Jastreb Šole 77 ===
Junkers=== (
Junkers Flugzeug-Werke A.G.) •
Junkers Ju 322 Mammut – Mammoth ==Notes==