Sergey Morgunov (born 9 February 1993) is a Russian track and field athlete, specializing in the long jump.

On 20 June 2012 he set the World Junior Record in the event, jumping 8.35m (with a +1.1 wind) in Cheboksary, Russia.

The jump surpassed the longest standing record on the books, set by Randy Williams while winning the gold medal at the 1972 Olympics.

Previous to setting the record, Morgunov had won the 2011 European Junior Championships in come from behind fashion with a final jump of 8.18m at Tallinn, Estonia.

He had been in the lead of that event with a wind legal 8.10m (+0.2), only to see it surpassed in the final round by Poland's Tomasz Jaszczuk.