East Sussex on Wikipedia.

Alciston. The dedication is lost. From an old postcard in Geoff Watt's Collection. Link.
Alfriston, St. Andrew. From an old postcard, Bulman Collection. Link.

Battle, St. Mary. © Mark Turbott. Battle Abbey. From an old postcard, Bulman Collection. Link.
Beckley, All Saints. TQ 843 237. From a postcard in the Kevin Gordon Collection. Link.
Beddingham, St. Andrew. TQ 445 079. © Kevin Gordon. Link.
Bexhill, St. Mary Magdalene. From an old postcard, Bulman Collection. The card was posted in 1957, but is evidently much older.
Brightling, St. Thomas a Becket. The pyramid is the tomb of the one-time MP "Mad Jack" Fuller. TQ 683 210. From a postcard in the Kevin Gordon Collection. Link.
Brighton.

Chailey, Free Church. © Geoff Watt.
Crowhurst, St. George. From an old postcard, Bulman Collection. Link1. Link2.

Denton, St. Leonard. Interior view. TQ 454 025. Both © Kevin Gordon. Link.
Ditchling, St. Margaret. TQ 325 153. From an old print in the Kevin Gordon Collection. Link.

Eastbourne.

Frant, from an old postcard, Bulman Collection.
Friston, St. Mary the Virgin. TV 552 982. Kevin says the church is now surrounded by trees. From a postcard in the Kevin Gordon Collection. Link.

Glynde, St. Mary the Virgin. TQ 457 093. © Kevin Gordon. Link.
Groombridge, St. Thomas the Apostle. Link. St. John. Both from an old postcards, Geoff Watt's Collection.

Hampden Park, St. Mary. Link. St. Joachim (R.C.). Both © Graeme Harvey.
Hastings.
Herstmonceux, All Saints. TQ 643 102. © Kevin Gordon. Link.
Hove.

Icklesham, St. Nicholas. © Geoff Watt. Link.
Iford, St. Nicholas. TQ 408 074. From a postcard in the Kevin Gordon Collection. Link.

Lewes.
Litlington, St. Michael the Archangel. 199 TQ 523 019. © Dave Westrap. Link.
Lullington, Church of the Good Shepherd. One of the smallest churches in Britain, though only the remaining portion of a once larger church. From an old postcard, Bulman Collection. Link.

Maresfield, St. Bartholomew. From an old postcard, Bulman Collection. Link.
Mayfield, St. Dunstan. From an old postcard, Bulman Collection.

Newhaven, St. Michael. TQ 442 011. From a postcard in the Kevin Gordon Collection. Link. Christ Church, which stood on South Road, was demolished in 1969. From a photo in the Kevin Gordon Collection.

Offham, St. Peter. TQ 401 122. From a postcard in the Kevin Gordon Collection. Link.

Peasmarsh, St. Peter and St. Paul. © Bill McKenzie. Former chapel (now a private residence). © Geoff Watt.
Pevensey, St. Nicholas. From an old postcard, Bulman Collection.
Polegate, from an old postcard, Bulman Collection. U.R.C., formerly the Congregational Church. TQ 584  050. From a postcard in the Kevin Gordon Collection (posted 1907). Link.

Ringmer, St. Mary the Virgin. TQ 445 126. © Kevin Gordon. Link.
Rotherfield, St. Denys. From an old postcard (ca. 1910), Brett Jeffrey's Collection. Link.
Rottingdean, St. Margaret. From an old postcard (franked 1904), Bulman Collection.
Rye.
Rye Harbour, Church of the Holy Spirit (CoE). Memorial to Lifeboat men. 189 TQ 937 190. Both © Dave Westrap. Holy Trinity. TQ 938 192. From a postcard in the Kevin Gordon Collection. Link.

St. Leonards-on-Sea, Christ Church. From an old postcard (franked 1906), Bulman Collection. St. Ethelburga, built in 1929. From a postcard in the Kevin Gordon Collection. Link.
Seaford.
Southease, dedication lost. TQ 421 064. From a postcard in the Kevin Gordon Collection. Link.

Tarring Neville, St. Mary TQ 444 038. © Kevin Gordon.
Ticehurst, St. Mary the Virgin. From an old postcard, Bulman Collection. Link.

Upper Dicker, dedication unknown. TQ 553 099. From a postcard in the Kevin Gordon Collection.

Wadhurst, St. Peter and St. Paul. From an old postcard, Geoff Watt's Collection.
Waldron, All Saints. From an old postcard, Bulman Collection. Another view, from a postcard in the Kevin Gordon Collection. Kevin advises that this church is also known as All Hallows. TQ 549 193.
Wartling, St. Mary Magdalene. TQ 658 092. From a postcard in the Kevin Gordon Collection. Link.
Westham, St. Mary, situated beneath the walls of Pevensey Castle. TQ 642 046. From a postcard in the Kevin Gordon Collection. Link.
Winchelsea, St. Thomas the Martyr. From an old postcard, Bulman Collection. Link. Wesley's Chapel (Methodist). Winchelsea was the last place that John Wesley delivered a sermon, beneath a large ash tree, beside the old church.
Withyham, St. Michael and All Angels. From an old postcard, Steve Bulman's Collection. Link.
Wych Cross. At first glance this church looks a bit like Whippingham on the Isle of Wight, but it isn't. Diana Bond had asked for  help in identifying it. Paul Smith has advised that Wych Cross Church, which was dedicated to St. Richard de Wych, although never consecrated, was built in 1866 and demolished in 1975.