Weymouth and Portland - hosts of the sailing events at the 2012 Olympic and Paralympic Games - will be represented at the London Boat Show.
Work on the marina is due to be finished by the end of 2008
The borough's entry to the January 2008 exhibition - overseen by the council - will reflect its growing reputation as a key location for marine business.
The stand will showcase current regeneration and development projects.
The existing sailing academy is now being transformed into "a world class training and competition venue".
Weymouth and Portland Borough Council gave planning permission for the £21m Portland Marina at Osprey Quay in June.
The plans include a 560-berth marina, to be sheltered by the stone breakwater.
There will also be an on-shore reception centre with washrooms, showers and laundry facilities and a restaurant bar overlooking the harbour.
Work is due to be finished by the end of 2008.