See Leander class cruiser for the cruiser class of the same name.

The Leander class, informally known as the Type 12I, comprising twenty-six frigates, was arguably the most successful and popular class of frigates in the Royal Navy's modern history. The class was built in three batches between 1960 and 1968, each batch with a distinct role. It had an unusually high public profile, due to the popular and acclaimed Warship BBC television drama series.