Chancellor Gordon Brown, Tory leader William Hague, Lib-Dem leader Charles Kennedy and SNP leader John Swinney were there, along with Dewar's official spokesman Dave Whitton.
Senior Cabinet colleagues and MSPs were also invited and sat alongside Dewar's office cleaners and canteen ladies Betty Gordon and Trisha Richards, who served him his morning bacon rolls, and 200 of his constituents.
Dewar's ex-wife Alison sat in the second row of the church with husband Derry Irvine, the Lord Chancellor.
Dewar, who never remarried after his divorce in 1973, never spoke to Lord Irvine - an old Glasgow University friend - after he married Alison.
Dewar's World of Whisky is also sponsoring the world record attempt by 'Scot of The Arctic' Dave Mill, who is currently nearing the completion on his solo and unsupported walk to the North Pole from Canada.
This voucher entitles up to four people to FREE entry to Dewar's World of Whisky.
You can open the drawers of the desks and cupboards in the office and look at old order books and job contracts as well as some of the Royal Warrants Dewar has received.
In the centre of a room is a touch screen game where you can try to blend different whiskies to taste just like Dewar's White Label.
Dewar's was one of the first whisky companies to recognise the importance of advertising.
Having done his 20 lengths, the caption has him saying: "And now for Dewar's!"
Scottish football star Ally McCoist, who was visibly moved at Mr Dewar
's funeral, backed the idea as a "fitting way to pay tribute".