Dr John Cameron said Dignitas provided a "much needed service" for individuals who want to "die as they have lived" and said NHS claims that palliative care was available for all in Britain's hospitals were false.
Dr Cameron's comments are at odds with the views of the Kirk which opposes Independent MSP Margo MacDonald's controversial End of Life Choices Bill that seeks to legalise assisted suicide in Scotland.
Dr Cameron, 66, writing in next month's edition of Life and Work, the Church of Scotland magazine, said: "Dignitas provides a much needed service to strong-willed and assertive individuals who want to die as they have lived.
"At present, we force citizens facing terrible deaths to fly out prematurely to Switzerland since they must be sufficiently fit to travel.
"As a society, we are refusing to face this matter head-on and are offloading our ethical dilemma to another country. This is morally unacceptable."
Approximately 1,000 British citizens have travelled to die at one of Dignitas' rented apartments in Zurich.
Among them was motor neurone disease sufferer Reginald Crew, from Liverpool, who was filmed in 2003 at a Dignitas clinic before he was helped to end his life.
Dr Cameron was minister at Stephens and West Parish Church, Broughty Ferry, near Dundee, for 34 years before retiring last year.