Professional ratings
Aggregate scores
Source	Rating
Metacritic	73/100
Review scores
Source	Rating
AllMusic
Robert Christgau	B+
Classic Rock	7/10
The Daily Telegraph
MusicHound	4/5
Pitchfork Media	8.0/10
Q
Rolling Stone	(mixed)
The Rolling Stone Album Guide
Smash Hits	7/10

In Through the Out Door is the eighth studio album by the English rock band Led Zeppelin, and their final album of entirely new material. It was recorded over a three-week period in November and December 1978 at ABBA's Polar Studios in , Sweden, and released by Swan Song Records on 15 August 1979. In Through the Out Door was the band's eighth and final studio release to reach the top of the charts in America, and was the last released by the band before the death of drummer John Bonham in 1980.

The album is a reflection of the personal turmoil that the band members had been going through before and during its recording. For example, frontman Robert Plant and his wife had gone through a serious car accident, and their young son, Karac Plant, died from a stomach illness. All four band members also felt weary of dealing with record companies and other associates. Despite this, the release wound up being a huge commercial success, particularly in the United States (sitting at the #1 slot on Billboard's chart in just its second week on the chart).

The album was named by the group to describe its recent struggles amidst the death of Robert Plant's son Karac in 1977, and the taxation exile the band took from the UK. The exile resulted in the band being unable to tour on British soil for over two years, and trying to get back into the public mind was therefore like "trying to get in through the 'out' door."

In contrast to previous Led Zeppelin albums, In Through the Out Door features much greater influence on the part of bassist and keyboardist John Paul Jones and vocalist Robert Plant, and relatively less from drummer John Bonham and guitarist Jimmy Page. Two songs from the album—"South Bound Saurez" and "All My Love"—were the only two original Led Zeppelin songs that Jimmy Page had no part in writing. With the exception of "Darlene," a boogie-woogie based song credited to all band members (which was eventually released on the 1982 album, Coda), Bonham did not receive writing credits for any of the songs recorded at Polar Studios. This diminished input by Page and Bonham is attributed to the two band members often not showing up on time at the recording studio, with Bonham struggling with alcoholism and Page battling heroin addiction. As Jones said, "there were two distinct camps by then, and we [Plant and I] were in the relatively clean one."

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