The line’s Welcome Back programme will feature 11 cruises departing Dover and Liverpool this summer.
Sailings will take in the best of the British Isles, including Shetland and Orkney, and the Isles of Scilly.
New ship Borealis will be the first to set sail offering a three-night maiden voyage from Liverpool departing 5 July.
The line’s other new ship, Bolette, will depart on its maiden voyage from Dover on 16 August.
"So often overlooked, our British Isles are home to some of the most wonderful wildlife, and so much spectacular scenery that is best enjoyed from the water," said Fred Olsen managing director Pete Deer.
"With this selection of shorter sailings, guests can dip their toes back into cruising and enjoy all that they love about being on board with us, before we all begin to venture further afield again.
"This is an incredibly important milestone for our business, and we can’t wait to welcome our guests onboard our new-look fleet this summer."
Borealis’s four-night Scenic British Isles and Summer Wildlife no port cruise, departing Liverpool on 8 May, leads in from £549pp, while the ship’s five-night Scenic Orkney and Faroe Islands no port cruise, departing Liverpool on 17 July, leads in from £699pp.
Bolette’s five-night Touring Scenic Orkneys and Shetlands cruise, departing Dover on 24 August, leads in from £799pp.
