JRR may refer to:

• J. R. R. Tolkien (1892–1973), English writer, poet, philologist and university professor
• Jaime Robbie Reyne (born 1985), Australian singer
• Jay Robinson Racing, a racing team
• Jiru language

• Katarine Richardson
• Katarine Webb
• Katarin Quelennec
• Katarin Richardson
• Katarinu Zrinsku
• Katarin Webb
• Katari River
• Katari Veera
• Katari Veera Surasundarangi
• Katariveera Surasundarangi
• Katariya
• Katariya (disambiguation)
• Katariya, Ghazipur district
• Katariya, Kutch
• Katariya Lavmeet
• Katarki
• Katarki, Bilagi
• Katarki-Gudlanur
• Katarkigudlanur
• Katarmal
• Katarmala, Begusarai
• Katarovank
• Katarovank Monastery
• Katarqalai language
• Katarsis