The UK Centre for Carnival Arts (UKCCA) organised a parade through the town centre, with more than 1,200 taking part, before making its way to the park.
Organisers have estimated that around 15,000 people turned up to mark the milestone anniversary.
Executive producer of the Luton International Carnival, Steve Pascal (known as Pascal), said: “All the communities in Luton were represented, and we had a really decent offer.
“In terms of entertainment value, family value… it just hit everyone.”
Look out for an 8-page picture special in THIS week's edition of the Luton News - on sale from Wednesday, May 27
We managed to get plenty of snaps of people in their best costumes, scroll through and see if you can spot yourself.
5. 50th Luton International Carnival
A Luton Town mascot leading children through the town Photo: Jane Russell
6. 50th Luton International Carnival
Cadets from Bedfordshire Police made an appearance. Photo: Jane Russell
7. 50th Luton International Carnival
Hillborough Junior School were part of the fun. Photo: Jane Russell
8. 50th Luton International Carnival
Members of the Polish community donned heart-shaped costumes. Photo: Jane Russell