A special service will be held at Southwark Cathedral to celebrate the contribution of firefighters to the safety of communities and to honour firefighters who have lost their lives in the line of duty.
The service will follow more than 50 wreaths being laid at St Paul's by the Firefighters' Memorial, the biggest wreath-laying ceremony at the memorial.
The Fire Brigade Union will then conduct a procession with banners across Millennium Bridge towards Southwark.
Leading figures from the fire and rescue service community will be in attendance.
The service at Southwark Cathedral aims to be 'Commemorative and Celebratory' and will streamed online as well.
Matt Wrack, general secretary of the FBU, said: "This is a once in a generation event, the largest of its kind, which will celebrate the fire and rescue service, our union and commemorate the friends we have lost along the way.
"When our union was first formed firefighters lived on stations, had the most basic protective equipment and were paid less than unskilled labourers. Today's fire service is far from perfect but the improvements we have seen are the result of campaigns run by our members over 100 years.
"In our centenary year, we have been celebrating the work of firefighters who have shaped the modern fire and rescue service and improved the safety of our communities. Reflecting on the experiences of our proud past can guide us in strengthening our union for the future."
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