More than 200 across the UK are holding events to promote cruising and highlighting the huge variety of destinations.
A record 1.5million Brits will cruise this year and the choice of liners has never been greater from cosy, luxury yachts to floating passenger "resorts" offering everything from rock climbing to surfing.
Andy Harmer, of the Association of Cruise Experts, said: "This week is a great way to show there is a cruise to suit all ages and all pockets.
"You can find snow or sun, desert or jungle, relaxation or activity-the choice is endless."
For more info see www.discover-cruises.co.uk