- Tangmere, Chichester District, West Sussex
- Tarring Neville, Lewes District, East Sussex
- Tarring, The hundred of
- Telscombe, Lewes District, East Sussex
- Terwick, Rogate, Chichester District, West Sussex
- Thakeham, Horsham District, West Sussex
- The River Adur
- The River Arun
- The River Lavant
- The River Ouse
- The Rother
- Thorney Island, Chichester District, West Sussex
- Three Bridges, Crawley, West Sussex
- Three Oaks, Rother District, East Sussex
- Thundersbarrow Hill, near Bramber, West Sussex
- Ticehurst, Rother District, East Sussex
- Ticehurst: Ticehurst House (The Priory Hospital)
- Tilgate Forest, Forest Row, East Sussex
- Tillington, Chichester District, West Sussex
- Tipnoak, The hundred of
- Toddington, part of Littlehampton, Arun District, West Sissex
- Todham
- Tortington, Arun District, West Sussex
- Towncreep, Penhurst, East Sussex
- Treyford, Chichester District, West Sussex
- Trotton, Chichester District, West Sussex
- Tunbridge Wells , Kent (only Sussex related matters)
- Turner's Green, Mid Sussex District, West Sussex
- Turners Hill, Mid Sussex District, West Sussex
- Twineham, Mid Sussex District, West Sussex
