'I am very, very happy,' said Jimenez, who titled at the Johnnie Walker Classic earlier this year. 'The most important thing is that I played very well all week. If I missed a shot I always recovered.'
Terry Price used a brilliant eagle at the par-5 18th that capped off a course record 64 at Le Meridien to take second place alone at 14-under-par 274. Graeme McDowell and Klas Eriksson were one shot further back at 13-under-par 275 after matching rounds of 67.
Jimenez was part of a three-way tie for first to start the final round and after collecting only two birdies on Saturday, the Spaniard got off to a better start Sunday with a pair of birdies over his first five holes alone.
At the par-4 ninth, Jimenez landed his approach inside 17 feet and ran home the birdie putt to move ahead at 14 under. Jimenez then two-putted for a birdie at the par-5 10th to hold off his advancing challengers.
Jimenez dropped a shot at the par-3 13th, his first bogey since the opening round, and found himself in a share of the lead with Price after the Australian left his second shot to the par-5 last within three feet for a closing eagle.
Jimenez persisted and landed his tee shot on the middle of the green at the par-3 16th. The 40-year-old converted for birdie to take the outright lead with two holes to play.
He knocked his second shot in a greenside bunker at the 18th, but hit an outstanding third out of the sand that rolled two feet past the cup. Jimenez then tapped in for birdie and his ninth career victory on the European Tour.
'I felt good all week, only making three bogeys in four rounds,' said Jimenez. 'I knew Terry Price had finished with 14 under par. But I never got nervous and fortunately made two coming home.'
Lynn, who was seeking his first career victory, kept pace with Jimenez early in the round with birdies on the second and the fifth.
The Englishman found trouble with a bogey at the sixth but came back to birdie the eighth for a share of the lead at 13 under.
Lynn's title hopes were derailed at the par-5 11th, however, and he walked off with a double-bogey to fall back to minus-11.
Lynn managed a birdie at the 15th en route to a round of 71. He was joined by Ignacio Garrido, Jean-Francois Remesy and David Park in a tie for fifth at 12- under-par 276.
Emanuele Canonica, Gregory Havret, Paul Eales, Damien McGrane, Jose Manuel Lara, Fredrik Andersson and Desvonde Botes were one shot further back at 11- under-par 277.