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;De [[Legendarium Tolkien|legendario]]
* 1937: ''[[Hobbitus Ille]]'' (Anglice: ''The Hobbit'')
* 1954-1955: ''[[Dominus Anulorum|The Lord of the Rings]]'' (Ang.Latine: ''TheDominus Lord of the RingsAnulorum'')
*# 1954: ''[[The Fellowship of the Ring|Comitatus Anuli]]'' (AngLat.: ''TheComitatus Fellowship of the RingAnuli'')
*# 1954: ''[[The Two Towers|Binae Turres]]'' (AngLat.: ''TheBinae Two TowersTurres'')
*# 1955: ''[[The Return of the King|Regressus Regis]]'' (Ang.: ''TheRegressus Return of the KingRegis'')
* 1962: ''[[FortunaThe TomiAdventures of Tom Bombadil]] acand CarminaOther alienaVerses efrom Rubrothe LibroRed Book'' (AngLat.: ''The Adventures ofFortuna Tom Bombadil'' and''ac OtherCarmina Versesaliena frome theRubro Red BookLibro'')
''cuius posthuma:''
* 1974: ''[[Bilbonis Ultimum Carmen]]'' (Ang.: ''Bilbo's Last Song'')
* 1977: ''[[Silmarillion]]'' (Ang.: ''|The Silmarillion]]'')
* 1980: ''[[Imperfectae Fabulae]] de'' ''Númenor Terraque Media'' (Ang.: ''Unfinished Tales of Númenor and Middle-earth'')
* 1983-1996: [[Terrae Mediae Historia|''TerraeThe History Mediaeof HistoriaMiddle-Earth'']]
*# 1983: [[Liber Perditarum Fabularum I|''Liber Perditarum Fabularum I'']] (Ang.: ''The Book of Lost Tales 1'')
*# 1984: [[Liber Perditarum Fabularum II|''Liber Perditarum Fabularum II'']] (Ang.: ''The Book of Lost Tales 2'')
*# 1985: ''[[Carmina de Beleriand]]'' (Ang.: ''The Lays of Beleriand'')
*# 1986: ''[[De Formatione Terrae Mediae]]'' (Ang.: ''The Shaping of Middle-earth'')
*# 1987: ''[[Via Perdita ac alia scripta]]'' (Ang.: ''The Lost Road and Other Writings'')
*# 1988: ''[[RegressusThe Return Umbrae]]of the Shadow'' (AngLat.: ''TheRegressus Return of the ShadowUmbrae'')
*# 1989: ''[[De Proditione Isengardi]]'' (Ang.: ''The Treason of Isengard'')
*# 1990: ''[[BellumThe AnuliWar (liber)|Bellumof Anuli]]the Ring'' (AngLat.: ''TheBellum War of the RingAnuli'')
*# 1992: ''[[Sauron Victus]]Defeated'' (AngLat.: ''Sauron DefeatedVictus'')
*# 1993: ''[[Anulus Morgoth]]'' (Ang.: ''Morgoth's Ring'')
*# 1994: ''[[BellumThe Gemmarum]]War of the Jewels'' (AngLat.: ''TheBellum War of the JewelsGemmarum'')
*# 1996: ''[[PopulaThe TerraePeoples Mediae]]of Middle-earth'' (Ang''Lat.: De''The Peoples''Populis ofTerrae Middle-earthMediae)'')
* 2007: ''[[Liberi de Húrin]]'' (Ang. ''The Children of Húrin'')
* 2017: ''[[Beren et Lúthien]]'' (Ang.: ''Beren and Lúthien'')
* 2018: ''[[Casus de Gondolin]]'' (Ang.: ''The Fall of Gondolin'')
* 2021: ''[[DeThe NaturaNature Terraeof Mediae]]Middle-earth'' (AngLat.: ''TheDe NatureNatura ofTerrae Middle-earthMediae'')
;Aliae fabulae
* 1945: ''[[Folium a Nodo pictum]]'' (Ang.: ''Leaf by Niggle'')
* 1945: ''[[Fabula de Aotruvi et Itruni]]'' poema (Ang.: ''The Lay of Aotrou and Itroun'')
* 1949: ''[[Aegidius Agricola de Hammo]]'' (Ang.: ''Farmer Giles of Ham'')
* 1953: ''[[Reversio de Beorhtnoth filio de Beorhthelm]]'' versifica fabula (Ang.: ''The Homecoming of Beorhtnoth Beorhthelm's Son'')
* 1967: ''[[Via semper continuit]]'' carmina cum Donaldo Swann sripta (Ang.: ''The Road Goes Ever On,'' withlibellum Donaldcarminum cum Donaldo Swann, a song-cycle'')scriptum
* 1967: ''[[Smith e Vutone Maiore]]'' (Ang.: ''Smith of Wootton Major'')
;Opera philologica
* "[[English and Welsh]]"
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