My top 3 would be:

Keith Richards-what can you say about this guy? Just superb.

Kurt Cobain-made me want to pick up a guitar at 13, songs and lyrics still amazing.

Jonny Marr-Fantastic player, technichally superb and wrote some riffs that make me wonder how the hell he came up with them.

Lennon & McCartney - Musicwise, the earliest and biggest influences

As a pianist, apart from my teachers, I'd say Ben Folds, Jamie Cullum, Herbie Hancock, Iiro Rantala.

Pink Floyd, Iron Maiden, and Paco De Lucia. Maybe some Sergei Orekhov.

The chronological order in which I'd discovered their music would be:

Ritchie Blackmore
Toni Iommi
Randy Rhodes
Dave Murray
Alex Lifeson
Kirk Hammet (shut it)
Michael Schenker
Yngwie Malmsteen
Andres Segovia
Joe Satriani
Steve Vai
Eric Johnson
Gary Moore
Tommy Bolin
Shawn Lane
Christopher Parkening
Steve Stevens
Buckethead
Derek Trucks

There are loads of other great guitarists that I've loved listening to over the years and just kept it at that, like SRV. I just left his stuff alone. These are the artists that inspired me to try and learn their music. Not just a tune or two, but multiple tunes off of their catalogs of albums, and with that I'd try to cop nuances of their style because I liked it. It's hard to get inspired anymore though, and I'm not sure if old age comes into play, but it just seems like pretty much everything sounds the same to me these days. I could say Guthrie Govan is an inspiration, but a style like that is more of a passing whimsy than anything for me, and anything shred like Paul Gilbert is the same. I just don't want to play like that anymore, which would probably explain the cut-off at Derek Trucks.

After 30+ years of playing, I may need to take a well needed break, or just mellow the fuck out for a while.

I think my most engrained influences are, ironically, from artists I don't actually listen to much. My guitar teacher's favorite musician was always B.B. King, and it was extremely evident in his playing style, so naturally that influence wore off on all of his students. It's still front and center in my playing, years after I left lessons, even when I'm playing metal. I'm not a huge Zeppelin fan (I do love me some Zeppelin, just not all of it), but there's a lot of Jimmy Page in my playing and writing style, also an influence I picked up from my guitar teacher back in the day. I still hear a ton of Iommi in my playing as well, although that's a lot more of a conscious influence than Page or King. These days I've been constantly binging desert rock, sludge, and doom. That has really worn off on my playing style and has pretty much become the dominant style I write in (which may be kind of unfortunate considering it doesn't do much for improving your skill as a guitarist), so of course I hear a lot of Kyuss (Josh Homme) in there. I've been incorporating a lot of blues / country sort of licks into our songs, in the vein of John Fogerty and Duane Allman. I try to get some David Eugene Edwards vibes in there but it's pretty difficult considering he primarily rocks the banjo.

Jimmy Page. I was a teenaged guitar player during the 70s. Nuff said.

Al DiMeola, John McLaughlin, Steve Morse, Steve Howe, Steve Hackett, Randy Rhoads, Robin Trower, Ted Nugent, Ronny Montrose, Billy Gibbons, Tony Iommi, Allan Holdsworth, Larry Coryell, Shawn Lane, Eddie Van Halen, George Lynch, Chris Poland, Reb Beach, and about a hundred or so other guys.

Right on, I've only recently discovered Robin Trower (a couple of months ago) and I've been trying pretty hard to incorporate a lot of his mannerisms into my playing. I love playing a Telecaster like a Stratocaster. He throws a lot of cool open string **** into his riffs that I don't hear many other people doing.

Example:
Little Bit of Sympathy's main riff.

My favorite rock guitarists are Nancy Wilson of Heart, Jimi Hendrix, and Jimi Page. I think some of the classical great include Miriel Anderson, Christopher Parkening. Some great blues guitarists are Eric Clapton and keb Mo.

My guitar playing was influenced alot by Tobin sprout from Guided by voices and both guitarist from Sonic Youth and ofc Joey santiago.

As a singer Black francis inspired me, but not be loud, to be wacky and to find a vocal melody in off beat rhythms.
Also Daniel johnston, his vocals have a naive quality about them that feel very pure.

My sense of composition was inspired by GBV cause even though i luv the pixies, im not a loud guy myself.
By emulating them, GBV taught me how to make a simple song shine if you just find the right vocals.

My more recent influences have been Deerhoof and Django. oh, and Jay reatard.

Alphabetical order.

Albert King
Blind Willie Johnson
Dick Dale
Freddie King
Jack White
Jon Fratelli
Paige Brubeck (From the Indie band Sleepy Kitty)

Personally I feel they've all effected me in small, but noticeable ways. I honestly don't know if I could say exactly how at this point in time, however.