It has fought to protect historically significant buildings and landmarks across the city for the last 100 years.
And this lunchtime, the Norwich Society met at the 14th-century Bishop's Bridge, where the movement started a century ago after the society stopped it from being demolished as part of a road and river widening proposal by the local authority.
Since then its members have helped save Elm Hill, the Assembly House and Tombland, among other historical buildings as well as highlighting important architecture in the city through design awards.
Its chairman, Barry Howell, said the organisation was as important today as it was when it was set up and hopes to be around for the next 100 years.
READ MORE: Sculpture to be removed from city's most unloved square
He said: "We were first created as a pressure group to stop what was deemed to be architectural vandalism but over time we have changed.
"A lot of what we do is educate people. We are trying to get people to think about the impact of climate change on the city.
"We know there are monetary constraints and there will always be compromise with development but it needs to enhance the city, not damage it.
"Norwich is a great asset. If you have a nice city to live, work and play in, that would create inward investment."
READ MORE: Criticism of major £4.4m roundabout revamp plan grows
He added the city had a rich architectural heritage spanning 1,000 years and the society is opposing the redevelopment proposals for Anglia Square by developers Weston Homes and site owner Columbia Threadneedle because of the height of the proposals.
Mr Howell added: "It's fair to say the relationship between the society and Norwich City Council has been a bit of a rollercoaster but the bond that ties us together is strong enough for future projects."
At the centenary event launch, Lord Mayor of Norwich Dr Kevin Maguire, said: "Norwich needs the Norwich Society.
"We must have alternative views in society. They help us think."
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here