The R-class patrol boats was a class of Finnish patrol boats, originally constructed as coastal minesweepers.

They were then used for sea patrol and as anti-submarine warfare vessels.

However, the Finnish Navy used the designation R class for all five vessels.

The R class was much liked in the Finnish Navy, due to their low fuel consumption and their good seagoing qualities.

They were in principle unsinkable (the vessels could have a list of 115 degrees without sinking and still return to upright position).