Elite athletes including Callum Hawkins and Jo Pavey are among runners taking part in the Great Scottish Run.
Hawkins won the half-marathon last year but his record-breaking time was invalidated after the route was found to be too short.
More than 30,000 people are taking part in the event around central Glasgow which started at 11:30.
Earlier, the first female finisher in the elite wheelchair race was Scottish World Champion Sam Kinghorn.
A 10km race was also held on Sunday morning, with Stuart Gibson first across the line in 31 minutes 37 seconds. Rebecca Murray was the first female finisher with a time of 34 minutes and 30 seconds.
Other events for families and children were held in George Square on Saturday.
There will be a series of road closures in Glasgow city centre and Traffic Scotland has warned that the A814, M8, M77 and M74, as well as local roads around the city centre, may be busier than usual.
Rail services around Glasgow will also be disrupted, with replacement buses operating on some services.
Ahead of the race, Hawkins said he was happy to return to Glasgow to defend his title.
“It’s my home city, the crowds are always big,” he said.
“They know how to put on a sporting event. Sport in Scotland and Britain is on the up and up and everyone gets behind it.”
More From this publisher : HERE