Best debut album

So my 2 favorite debut album are as follows

1.Steely Dan Can’t by a Thrill
2. 3rd Eye Blind 1997 release 
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Different genre than what is so far presented.. but.. Nancy Wilson ('s) with Cannonball Adderly.
I just gotta echo the selections mentioned by all you guys.  That Nancy Wilson with Cannonball Adderly!  Zeppelin!  Doors!  Are You Experienced!  I'll add Pearl Jam's debut.

Moby Grape, The Byrds, Buffalo Springfield, The Band, Randy Newman, Van Dyke Parks, Jellyfish, Iris Dement, Gram Parsons, The Flying Burrito Brothers, The Dwight Twilley Band, The Beat (U.S., not U.K.), Dave Edmunds, Nick Lowe, Rockpile, Marshall Crenshaw, The Bonzo Dog Doo Dah Band, Buddy Miller, Moon Martin, Mink DeVille, Elvis Presley, Buddy Holly & The Crickets, Carl Perkins, The Everly Brothers, The Ventures, Cream, The Jimi Hendrix Experience, The Yardbirds, The Animals, The Beau Brummels, Manfred Mann, The Who, Cheap Trick, The Grateful Dead, The Paul Butterfield Blues Band, Ry Cooder, Leo Kottke, Pentangle, Fairport Convention, The Lovin’ Spoonful, Crosby, Stills, & Nash, Simon & Garfunkle, Blood, Sweat, & Tears, The Flamin’ Groovies, The Sex Pistols, The Clash, Television, Jonathan Richman, Loudon Wainwright III, this list goes on and on.

Damn @bkeske, where ya been all my life? ;-)

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There are so many....but one that sticks is the fresh sound The Police delivered with  ‘Outlandos d’Amour’
In the court of the Crimson King
Led Zeppelin
Are you experienced
Saucerfull of secrets
Oh, just one? That’s easy: Music From Big Pink. It changed the world for every good musician I know, and many I don't (Eric Clapton, Nick Lowe, Neil Young, hundreds of others).
I am going to go a slightly different route from my learned colleagues here and take the path slightly more obscurious.

The Least We Can Do Is Wave To Each Other .... Van Der Graaf Generator.

A Blueprint of the World ..... Enchant.

Mirage ..... Camel.

Motörhead S/T.

All truly superb first efforts.
And paved the way for even greater successes.

And if you want a favorite out of those it would have to be Van Der Graaf

petg60 -- Pink Floyd's first album was Piper at the Gates of Dawn.  I actually went looking for it in my vinyl collection.  Damn, I must have sold it eons ago.  I bought it for Interstellar Overdrive.
Lots of great ones already listed. I’ll add Steve Forbert Alive on Arrival. The tune “It isn’t going to be that way” hit me hard. 
@edcyn you are right my mistake that was the one but i typed the second one, what was in my mind?
When I first heard Boston’s debut I thought it was their greatest hits album.

Favorite one, though? Maybe NWA’s "Straight Outta Compton" or the Beastie’s "License to Ill" Maybe even Phish’s "Junta"
Or maybe even Sting's "Dream of the Blue Turtles" or Nick Drake's "Five Leaves Left" (yes, I know that's not really Stings DEBUT album, but whatevs)
The problem with Boston, its too perfect. Rock needs to have at least a few rough edges here and there. Boston is so finely crafted it puts Aja to shame. I am of course being sarcastic. Wish I'd thought of it.
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Tord Gustavsen Trio - Changing Places

Even though it wasn't that long ago in 2003, it inspired a lot of incredible Norwegian jazz that followed it.

Tracy Chapman - self titled album. Not just "Fast Car", but a great album across the board.
Van Halen’s 1978 debut. I was 10 years old. This album still holds up 40+ years later. How about Nirvana’s Bleach? Pearl Jam. Stone Roses. 
@johnto Good call on CSN - that also reads like a greatest hits disc
@jrod68. So true with PJ - "Ten" I consider the most influential album of the 90's
Did I ever mention that I didn't like CSN's debut album because I thought it felt fussed over and a little tame?  Then I saw them in concert at either the Greek or the Hollywood Bowl.  They were wonderful.  Loose and virtuosic. They got still better when Neil Young came on stage as "special guest."  In any case, I continued to try and like the album but I never could quite accept it.  Wound up selling it.
+1 on mhe with Metheny’s Bright Size Life...

but have to say Captain Beyond...a heavy mind-meld with the cosmos
Possibly the most eagerly anticipated, the most explosive, the most iconoclastic album in my memory was Never Mind the Bollocks by the Sex Pistols.

I think all the songs have stood the test of time well, but to really ’get it’ you had to be following the music scene here in the UK in 76/77.

Their social impact was immense and the fallout had an after-life lasting decades. They made the Stones look like a bunch of naughty chartered accountants.

Their manager Malcolm McLaren might have thought he was orchestrating some kind of retro Rock N Roll experiment but soon found himself way out of his depth. As a direct consequence the unfortunate band members Lydon, Matlock, Cook and especially Steve Jones spent years of living through post-traumatic stress disorder.

Sid Vicious, bassist and figurehead, didn’t even make it that far.
Pink Floyd, “The Piper At The Gates Of Dawn“

This album single handedly got me out of pop music and into the more intricate type of music. I have been a huge PF fan ever since, for 53 years and counting. 
As much as I loved the Sex Pistols, they were too much of a one trick pony.  I still regret, though, that I missed them when they played the Roxy (or was it the Whisky?).  I went to buy a ticket.  They had already sold out....not the Pistols themselves, though!
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The Killers Hot Fuss.
The Clash The Clash
Talking Heads 77
Dead Kennedy's Fresh Fruit For Rotting Vegetables
The Specials
Could go on and on............. 
1. The B-52’s (Now it’s more enjoyable with the MFSL edition of the LP)

2. The Pretenders (Love listening to an angry Chrissie Hynde)