The Deep by Terry Farrell, Edward Cullinan's Downland Gridshell, Future Systems' memorable Birmingham Selfridges, Frank Gehry's Maggie's Centre, the Tyree ferry terminal by Sutherland Hussey and Norman Foster's Gherkin will all feature on different stamps.
The release is being timed to coincide with Architecture Week and the London Architecture Biennale, which both kick off at the end of next week.
The aim is to show the variety, in both style and scale, of the contemporary architecture scene.
Royal Mail's head of stamps, Julietta Edgar, said: 'Modern architecture has transformed our towns and cities in recent years and the very best examples of these exciting new buildings have been chosen for this issue.
'Since the millennium, Britain has been at the forefront of contemporary architecture, and Royal Mail is proud to celebrate that achievement,' she added.