Massive Attack are most commonly labelled a Trip-Hop band.
The most obvious other band that came from the same Bristol scene is Portishead ; you might also want to check out Tricky 's first solo album, Maxinquaye .
The term 'Trip-Hop' was supposedly used even earlier to describe DJ Shadow 's In/Flux single, so he might also be worth a listen (starting, of course, with Endtroducing... )
As a slightly downbeat dance-influenced music, you might also give Gorillaz a try; I wonder if you might also like Model 500 's Mind and Body album -
e.g. Rain .
Another laid back techno-with-vocals work
I'm listening to now : William Orbit 's Strange Cargo Three .
maybe a bit clichéd/cheesy
but it's so well done.
musicfans.stackexchange.com/users/None/
Everyone is forgetting about UNKLE - a British trip-hop band with some amazing pieces, Lonely Soul being the first one you need to hear.
I absolutely agree about Hooverphonic, Portishead and Morcheeba , those'd be my first picks too.
Groove Armada have some songs that are in this sort of style, Think
Twice
I think you'd really love!
Next, we are moving on to The Chemical Brothers -
I think you'll absolutely love the entire Come With Us album , specifically The Test,
The State We're In !
I fell in love with those songs instantly, and Massive Attack are one of my fave bands :)
Nice taste in music
everyone's got in this topic!
You might want to check out Santigold as well, it's not exactly trip-hop
I guess,
but she's a really underestimated female artist with a great sound!
musicfans.stackexchange.com/users/478/Warren B.
I started a Massive Attack channel on Pandora a couple of years ago and my eyes were opened.
Portishead - Dummy
(The whole album is actually quite good) Tricky - Maxinquaye ( 1 2 3 ) Zero 7 - Various albums, but " Simple Things " and " When It Falls " are my two favorite.
( 1 2
3 4 )
Nightmares on Wax ( You Wish , Passion , Les Nuits )
Hooverphonic ( 2 Wicky ) Thievery Corporation -
The Richest Man In Babylon
( Until the Morning ) FC Kahuna - Most is too electronic for me, but Hayling felt
right DJ Shadow ( In/Flux ) Télépopmusik ( Breathe , Don't Look Back )
Groove Armada ( Inside My Mind (Blue Skies) )
Little People - Mickey Mouse Operation Natalie Imbruglia ( Leave Me Alone ) Sneaker Pimps ( 6 Underground ) Morcheeba - So often mentioned, but I personally don't see the similarities in the vast majority of their work.
Who Can You Trust is the most applicable album I think.
musicfans.stackexchange.com/users/725/UnhandledExcepSean
There's also a Belgian band who made awesome triphop music in their early days: Hooverphonic fka Hoover.
Their first 2 albums 'A New Stereophonic Sound Spectacular' and 'Blue Wonder Power Milk' are really nice ones.
If you are more into instrumental music, you should listen to the French band Air .
They made beautiful albums like 'Walkie Talkie' and 'Moon Safari'.
musicfans.stackexchange.com/users/408/Simon Ravelingien
Another place to look is under the label "downtempo.
" There was a lot of great stuff on Ninja Tune records in the 1990s...
musicfans.stackexchange.com/users/174/Robert Fink
Most of the other suggested artists don't have that particular dark, almost post-punkish atmosphere of the later Massive Attack.
If that is what you like about them, I recommend the first two albums "Balance of the Force" and "The Night Garden" and the EP "Northern Light" by Austrian Producer Waldeck .
His later works are rather in the electroswing genre.
Another - also Austrian - band that plays trip-hop with a dark post-punkish vibe to it are Sofa Surfers , in particular their 2005 self-titled album and those following it.
Also you need to check out the band Archive , in particular their superb album "Controlling Crowds", they also play a rather dark brand of trip-hop.
musicfans.stackexchange.com/users/488/Jan Johannsen
Immediately K.Flay comes to mind.
Take for example:
https://soundcloud.com/kflay/make-me-fade-2 Slow tempos,
Hip-Hop grooves, trippy electronic samples and female vocals.
musicfans.stackexchange.com/users/511/Leo
This is a bit old and there's a lot of great stuff covered here, but I feel I should add you might check out some of the anticon.
acts and associates such as Themselves , and cLOUDEAD .
musicfans.stackexchange.com/users/1103/user1103
There is a total dark-horse album that most people don't know about, that sounds very like the Bristol sound.
For me it was an aquired taste but it's lived with me since the late 90's Archive Londinium.
You can listen to an example of it here:
https://www.youtube.com/watch?v=SpG_17E8hK4&list=PL613B7BEA538CBC59
musicfans.stackexchange.com/users/3100/Tim
I love Massive Attack; they are one of my favorite "bands" in the world. And I want to find something similar to them, but more like the albums:  Mezzanine ,  100th window  and  Heligoland . Any suggestions?
Bands that sound like Massive Attack?
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<similar-artists>
musicfans.stackexchange.com/questions/664
musicfans.stackexchange.com/users/459/Zarathustrax
Portishead is another band from the same Bristol scene. Other similar albums include Nightmares on Wax ( You Wish, Passion, Les Nuits), Hooverphonic (2 Wicky) Thievery Corporation - The Richest Man In Babylon, and Groove Armada (Inside My Mind (Blue Skies)). Bands like Portishead, UNKLE, Nightmares on Wax, Hooverphonic, Thievery Corporation and Groove Armada  and the album '''Mxinquaye'' are very similar to Massive Attack. 
Other british bands like Portishead and UNKLE were recommended. The album Maxinquaye was also suggested The Bands Nightmares on Wax, Hooverphonic, Thievery Corporation and Groove Armada were recommended