The men's 800 metres at the 2017 World Para Athletics Championships was held at the Olympic Stadium in London from 14 to 23 July. The results of the men's 800 m T54 race on Monday 17 July were nullified and the race rescheduled to Friday 21 July after three competitors crashed at the 600-metre mark. Marcel Hug won the original race. The race took place on Friday evening without Richard Chiassaro who had been disqualified.