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.
13. 50th Luton International Carnival
This lady came dressed as a daffodil with some butterflies. Photo: Jane Russell
14. 50th Luton International Carnival
Luton Youth Council got into the spirit. Photo: Jane Russell
15. 50th Luton International Carnival
Kids wore their handmade costumes. Photo: Jane Russell
16. 50th Luton International Carnival
Luton mayor Javed Hussain took part in the festivities. Photo: Jane Russell