Dinas may refer to:

• Dinas, an area of Padstow, Cornwall
• Castle an Dinas, St Columb Major, an Iron Age hillfort at the summit of Castle Downs, Cornwall
• Treryn Dinas, a headland near Treen, on the Penwith peninsula, Cornwall
• Trereen Dinas, an Iron Age promontory fort at Gurnard's Head, Cornwall

• Dinas, Gwynedd, a large hamlet near Bontnewydd, Caernarfon
  • Dinas railway station, on the narrow gauge Welsh Highland Railway
  • Dinas (FR) railway station, disused Festiniog Railway station
• Dinas Cross, a village and community in Pembrokeshire
  • Dinas Island, (Ynys Dinas) a peninsula in the community of Dinas Cross
• Dinas Dinlle, a small settlement in Gwynedd
• Dinas Emrys, a hillock near Beddgelert, Gwynedd
• Dinas Mawddwy, a town and community in Gwynedd
• Dinas Powys, a village and community in the Vale of Glamorgan
  • Dinas Powys railway station
  • Dinas Powys hillfort
• Dinas Rhondda, a village near Tonypandy, Rhondda Cynon Taf
  • Dinas Rhondda railway station
• Castell Dinas, a hillfort and castle in southern Powys
• Llyn Dinas, a lake near Beddgelert, Gwynedd
• Pen Dinas, a large hill in Penparcau, on the coast of Ceredigion

• Dinas, Zamboanga del Sur, a municipality

• Arley Dinas (born 1974), a former Colombian football player
• Thanasis Dinas (born 1989), Greek footballer

• Dinas (weevil), a beetle genus in the tribe Sciaphilini

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