Here are some of the best pictures of the day.
13. Setting the pace
Taking part in the event. Photo: Pacemaker
14. In the pink
This group of runners made a colourful appearance. Photo: Pacemaker
15. Cruella and pups
Aaron Johnston in full costume for the Belfast City Marathon. Photo: Kelvin Boyes
16. Getting ahead with a hat
Colourful headgear and outfits were the order of the day. Photo: Pacemaker