4 x 4 is an album by American composer, bandleader and keyboardist Carla Bley with a chamber ensemble recorded in Oslo in 1999 and released on the Watt/ECM label in 2000.

[1][2] The Allmusic review by David R. Adler awarded the album 3 stars and stated "This batch of compositions is informed by Bley's distinctive brand of tongue-in-cheek playfulness...

While the entire eight-piece band is consistently a pleasure, some of the album's most appealing moments occur during several Bley/Swallow duet passages.

[3] The JazzTimes review by Aaron Steinberg said "Between gigs, the ruddy and no doubt road weary outfit took a time-out in Oslo to record 4 x 4.

Bley and the band sound happy to have the time to themselves, and they mostly take it easy on light-hearted tunes with fun but simple arrangements".