Former National MP and Children's Commissioner Roger McClay is due in court today accused of fraud.

McClay, 65, will appear in Auckland District Court facing more than 50 offences of using a document to obtain a pecuniary advantage relating his ex-MP perk of taxpayer subsidised flights.

Mr McClay was in Parliament for 15 years. He was later appointed Children's Commissioner and was honoured with a Queen's Service Order for his public service and work with children.