Please use a more specific subcategory, if appropriate:

• Afroasiatic languages – {{Afroasiatic-lang-stub}}
  • Chadic languages – {{Chadic-lang-stub}}
    • Biu–Mandara languages (Central Chadic) – {{BiuMandara-lang-stub}}
    • East Chadic languages – {{EastChadic-lang-stub}} (pages get categorised with Chadic)
    • West Chadic languages – {{WestChadic-lang-stub}}
  • Semitic languages – {{Semitic-lang-stub}}
    • Arabic language – {{Arabic-lang-stub}}
    • Hebrew language – {{Hebrew-lang-stub}}
• Austroasiatic languages – {{Austroasiatic-lang-stub}}
• Austronesian languages – {{Austronesian-lang-stub}}
  • Celebic languages – {{Celebic-lang-stub}}
  • Formosan languages – {{Formosan-lang-stub}} (pages get categorised with Austronesian)
  • Javanese language – {{Javanese-stub}} (pages get categorised with Austronesian)
  • Oceanic languages – {{Oceanic-lang-stub}}
  • Philippine languages – {{Philippine-lang-stub}}
• Constructed languages – {{Conlang-stub}}
  • Esperanto language – {{Esperanto-stub}}
• Dravidian languages – {{Dravidian-lang-stub}}
• Hmong–Mien languages – {{HmongMien-lang-stub}}
• Indigenous American languages – {{IndigenousAmerican-lang-stub}}
  • Algonquian languages - {{Algonquian-lang-stub}}
  • Arawakan languages - {{Arawakan-lang-stub}}
  • Macro-Jê languages - {{Macro-Jê-lang-stub}}
  • Mayan languages - {{Mayan-lang-stub}}
  • Oto-Manguean languages - {{Oto-Manguean-lang-stub}}
  • Tupian languages - {{Tupian-lang-stub}}
  • Uto-Aztecan languages - {{UtoAztecan-lang-stub}}
• Indigenous Australian languages – {{IndigenousAustralian-lang-stub}}
• Indo-European languages – {{IndoEuropean-lang-stub}}
  • Ancient Greek language - {{AncientGreek-lang-stub}}
  • Germanic languages - {{Germanic-lang-stub}}
    • English language - {{English-lang-stub}}
    • Yiddish language – {{Yiddish-stub}}
  • Indo-Aryan language - {{IndoAryan-lang-stub}}
  • Romance languages - {{Romance-lang-stub}}
    • Latin language – {{Latin-stub}}
    • Spanish language – {{Spanish-lang-stub}}
  • Slavic languages - {{Slavic-lang-stub}}
• Japonic languages – {{Japonic-lang-stub}}
• Mongolic languages – {{Mongolic-lang-stub}}
• Niger–Congo languages – {{NigerCongo-lang-stub}}
  • Atlantic–Congo languages – {{AtlanticCongo-lang-stub}}
    • Volta–Congo languages – {{VoltaCongo-lang-stub}}
      • Benue–Congo languages – {{BenueCongo-lang-stub}}
        • Plateau languages – {{Plateau-lang-stub}}
        • Southern Bantoid languages – {{SBantoid-lang-stub}}
          • Bantu languages – {{Bantu-lang-stub}}
            • Swahili language – {{Swahili-stub}}
          • Grassfields Bantu languages – {{Gras-lang-stub}}
      • Gur languages – {{Gur-lang-stub}}
      • Volta–Niger languages – {{VoltaNiger-lang-stub}}
• Nilo-Saharan languages – {{NiloSaharan-lang-stub}}
• Northeast Caucasian languages – {{NortheastCaucasian-lang-stub}}
• Papuan languages – {{Papuan-lang-stub}}
• Pidgin and creole languages – {{Pidgincreole-lang-stub}}
• Sign languages – {{Sign-lang-stub}}
• Sino-Tibetan languages – {{SinoTibetan-lang-stub}}
• Tai–Kadai languages – {{TaiKadai-lang-stub}}
• Turkic languages – {{Turkic-lang-stub}}
• Uralic languages – {{Uralic-lang-stub}}

Other possible categories for language stubs are:

• {{ling-stub}} for stubs about linguistics terms
• {{vocab-stub}} for stubs about individual words (many of which could also get the {{move to wiktionary}} template)
• {{writingsystem-stub}} for stubs about alphabets, letters of alphabets, and other writing system-related topics
• {{lang-book-stub}} for language, linguistics and translation book stubs

Also see Wikipedia:WikiProject Stub sorting/Stub types/Culture#Language and literature.