Anthony Steen has been made CBE in the Queen's Birthday Honours for his work tackling human trafficking.
Consevative Mr Steen quit his Totnes seat before the 2010 general election amid controversy over his expenses claims.
Devon-based Jo Pavey, the oldest woman in history to claim a gold medal at a European Championships, has been appointed MBE.
Pavey, then aged 40, won the women's 10,000m in Zurich last year.
Mr Steen said he was "delighted" to be "recognised in exposing what had been seen as hidden and underground."
Victims of people-traffickers were "duped" into coming to the UK and then subjected to "abuse, exploitation and violence", he said.
He announced his intention to stand down as MP for Totnes in May 2009, days after it was revealed he had claimed more than £87,000 for his country mansion over four years.
Among his expenses were claims for tree surgery, guarding his shrubs against rabbits, maintaining a separate cottage and overhauling his private sewage system.
Mr Steen denied his reputation was "tarnished" by the expenses scandals and stressed that he had not broken any rules.
"I got tied up in media hysteria," he said.
"I had a very good innings in Parliament. I thought it was time to move on and concentrate on something I have a passion about, which is the appalling lives that victims of trafficking experience."