DMS will handle all ad sales and sponsorship for the free-to-air channel, which launched earlier in the summer and is produced by Enteraction TV.
Martine Ainsworth-Wells, Visit London's general manager of marketing, said: "We chose DMS because of its track record in generating revenue for newly launched channels and for its independence. London TV will appeal to a broad range of advertisers and we want to maximise that potential. DMS is well placed to exploit the considerable partnership opportunities the channel can offer."
London TV broadcasts information and entertainment content designed to encourage tourists and help Londoners make the most of the city. It becomes a 24-hour station from this month and will be measured by Barb from October.
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