'It feels absolutely awesome. It means a lot,' Lynn said. 'To finally do it feels awesome to me. I didn't get that nervous about it really. As long as I knew I could make good swings, and not get too carried away I thought I could do it.'
Richard Green, who was looking for his second European Tour title, stumbled to a closing 2-over 72. He finished at 13-under-par 267 alongside Paul McGinley, who posted a 5-under 65.
Lynn began his day three strokes behind Green at Hilversumsche Golf Club. Lynn birdied the par-4 second for the fourth time in four days to move to 13 under. He then ran off four straight pars.
The Englishman dropped in a birdie at the seventh to get within one stroke of Green. Lynn ran home a 40-foot birdie putt at the par-4 ninth to tie Green for the lead.
Lynn and Green each slipped to minus-14 with bogeys at the 11th. The turning point came at the 14th when Green knocked his second shot over the green on the par-4, while Lynn dropped his second shot within 5 feet of the cup.
Green's chip nearly found the bottom of the hole, but spun out and he walked away with par. Lynn calmly sank his birdie putt to take the lead at minus-15. Lynn then two-putted for par at the next and got up-and-down for his par at the 16th.
'You've got to make key putts and they certainly went in for me today,' said Lynn. 'It could have gone the other way. There was a couple out there that Greenie could have made, which changes the whole thing. I just made those crucial putts at the right time and kind of hung on in the end.'
After a two-putt par at the 17th, Lynn two-putted for birdie at the par-5 closing hole for the three-stroke win.
'I was getting a bit carried away going up 17, as I actually got a bit of a tear in my eye, but I dragged myself together,' said Lynn. 'To know I had a few putts at the end was fantastic.'
Green opened with a birdie at the first, but tripped to a bogey at the fifth. He notched five straight pars before dropping a shot at the 11th. After four more pars in a row, Green faltered with a bogey at the par-4 16th. He could only manage to par the last two holes.
'It was a tough day and although I got off to a good start, things just didn't go my way,' said Green. 'But full credit to David, he played very well.'
McGinley, who is trying to play his way onto the European Ryder Cup team, dropped in back-to-back birdies from the second. He birdied the 10th for the first time in four rounds to move to minus-11.
The Irishman, who was 15th on the points list for the Ryder Cup coming into this week, picked up birdies at the 12th and 14th to get within one stroke of the lead. However, McGinley stumbled to a bogey on the 15th. He joined Green in second place with a birdie at the last.
'Today was a very difficult day,' said McGinley. 'The wind was in a different direction. It was the windiest day we have had and the course was really tricky. I played fantastically well. Overall it was a really good day. I have got no complaints. I gave it my best shot and came up just short.'
Andrew Raitt and Miles Tunnicliff shared fourth place at 9-under-par 271. Paul Marantz closed with a 4-under 66 to join Andrew Marshall (70) at minus-8.
Per Nyman took eighth place at 7-under-par 273 as he closed with an even-par 70. Graeme McDowell posted a final-round 67 to end at 6-under-par 274.