The London Theatre Guide - Online
Current schedules, tickets, seating plans and maps for Theatre in London. Also includes reviews of the various shows from theatre critics.

What's On Stage
Provides information on more than 2,000 performances around the country including theatre, opera, classical music, ballet and more. Current schedules, seating plans, reviews and ticket

Ticketmaster
One of the top providers of tickets for Theatre, Concerts, and Sporting Events. Provides lists of events and ticket booking.

London Theatre Guide from the Society of London Theatre
The Society of London Theatre's guide with listings of shows currently playing including brief descriptions.