Language	Who Speaks It (Notes)

Abyssal		Demons (spoken only)
Arabic		Humans
Battlespeak	Common (warriors)
Cantonese	Humans (Chinese)
Celestial	Angels (spoken only)
Dunael		Humans
Easterling	Common
English		Humans (Old & Middle, not modern)
Esperanto	Common (Humans)
Fairie		Elementals (magic)
French		Humans
Gaelic		Humans
German		Humans
Ghazhakh	Orks (Goblins)
Glyphic		Magic-users (written only)
Grumbarth	Ogres & Giants (variant of Olog-hai, spoken only)
Haradaic	Humans
Harghazhakh	Orks (Hobgoblins)
Hebrew		Humans
Hellenic	Humans (Greeks)
Hindustani	Humans	
Infernal	Devils (spoken only)
Japanese	Humans (Japanese)
Khazalid	Gnomes (bastardized Khuzdul)
Khuzdul		Dwarves (literacy is rare for non-Dwarves)
Kuduk		Halfling (derivitive of Khuzdul)
Latin		Humans (Romans & Christian-based priests)
Lossadan	Humans
Macedonian	Humans
Malayalam	Humans
Mandarin	Humans (Chinese)
Mongol		Humans
Morbeth		Common (Black Speech)
Nandorin	Elves (Drow)
Norwegian	Humans
Ogham		Humans ("Language of Trees", written only)
Olog-hai	Orks
Orgvar		Trolls (variant of Grumbarth, spoken only)
Orrakh		Orks (variant of Olog-hai)
Queekish	Skaven (there are dozens of variations)
Quenya		Elves
Rohirric	Humans
Romany		Humans
Runic		Humans, Dwarves (different languages, both are written only)
Russian		Humans
Sindarin	Elvish (ancient & very rare)
Snotgob		Orks (spoken only, a rudimentry version of Ghazhakh)
Spanish		Humans
Ssissyl'k	Lizardmen (mongrel Sskyzzl'k)
Sskyzzl'k	Dragons (non-royalty)
Swahili		Humans
Telerin		Elves (written only)
Tradespeak	Common (spoken only)
Uruk-hai	Orks (variant of Olog-hai spoken by the ruling class)
Waildyth	Nature-Signs (rangers, hunters, etc.)
Westron		Common
Wu		Humans (Chinese)
Zsiemisch	Dragons (royalty)