Olivia has frequently been a guest on other artist's albums. On some of the earlier discs her contribition is sometimes minor, for instance Olivia played recorder (but didn't sing) on Hank Marvin and John Farrar's eponymous 1973 album, and provided an ethereal emphasis on the single word Hammerhead in the chorus of James Reyne's song. Cliff Richard, of course, often featured her in a duet in the early days - Olivia is the first female singer he duetted with, in the 1970s when Olivia was a guest on his regular TV show. From the 1990s on Olivia frequently appeared in a duet on guest albums.

Olivia reciprocated with her own album of duets with other artists in 2002, the album (2).

I have taken a liberal interpretation of 'guest' appearances. I've included some various artists compilation albums where they feature the first release (or CD release) of one of Olivia's songs, like the German renditions of Long Live Love and Banks of the Ohio. These are identified as Various Artists.

A Few Best Men A Few Best Men

(2012)

Olivia sings on most of the tracks on this soundtrack album

This Christmas This Christmas

(2012)

duets with John Travolta

Elaine Paige and Friends Elaine Paige and Friends

(2010)

Elaine Paige CD, Olivia sings Amoureuse with Elaine

Christmas Is Christmas Is

(2008)

Mark Masri CD, Olivia duets on Every Time It Snows

Elvis Presley - Christmas Duets Elvis Presley - Christmas Duets

(2008)

Elvis Presley CD, Olivia duets on O Come All Ye Faithful

Duets: Friends and Legends (Anne Murray) Duets: Friends and Legends (Anne Murray)

(2007)

Anne Murray CD, Olivia duets on Cotton Jenny

Christmas Song (Mannheim Steamroller) Christmas Song (Mannheim Steamroller)

(2007)

Olivia on Christmas Lullaby

Dionne Warwick - My Friends and Me Dionne Warwick - My Friends and Me

(2006)

Dionne Warwick CD, Olivia duets on Wishin' and Hopin'

Tracks n Grooves - Cliff Richard Tracks n Grooves - Cliff Richard

(2004)

Olivia duets with Cliff Richard on the 1971 track Don't Move Away

Barry Manilow - Scores Barry Manilow - Scores

(2004)

Barry Manilow CD, Olivia duets on This Can't Be Real

1000 Nadelstiche 1970s Vol 8 1000 Nadelstiche 1970s Vol 8

(2002)
Various Artists

Olivia sings Banks ofthe Ohio - in German!

Electric Rodeo (Lee Kernaghan) Electric Rodeo (Lee Kernaghan)

(2002)

Lee Kernaghan CD, duet with Olivia on A Handful of Dust

My Romance (Jim Brickman) My Romance (Jim Brickman)

(2000)

Olivia sings two tracks, Valentine & Change of Heart

The Spirit of Christmas 2000 The Spirit of Christmas 2000

(2000)
Various Artists

Olivia sings a duet with Kenny Loggins on 'Have Yourself a Merry Little Christmas'

27th Olympiad Official music from the Opening Ceremony 27th Olympiad Official music from the Opening Ceremony

(2000)
Various Artists

Olivia sings Dare To Dream with John Farnham

'Tis The Season 'Tis The Season

(2000)

Olivia duets with Vince Gill for this Christmas CD

More Songs From Pooh Corner (Kenny Loggins) More Songs From Pooh Corner (Kenny Loggins)

(2000)

Kenny Loggins CD with Olivia duet on Flying Dreams

The Spirit of Christmas '99 The Spirit of Christmas '99

(1999)
Various Artists

Olivia sings 'The First Noel'

Mannheim Steamroller - Christmas Angel Mannheim Steamroller - Christmas Angel

(1998)

Olivia narrates part of the story but does not sing

Highlights from The Main Event Highlights from The Main Event

(1998)

Olivia tours Australia with John Farnham and Anthony Warlow - live album

Love Shouldn't Hurt Love Shouldn't Hurt

(1998)
Various Artists

Olivia features on the track Love Shouldn't Hurt

Cliff Richard 1970s Cliff Richard 1970s

(1998)

Olivia duets on the 1971 track Don't Move Away

The Raybon Brothers The Raybon Brothers

(1997)

Olivia duets on the track 'Falling'

Best Of Dance Music vol 4 Best Of Dance Music vol 4

(1996)
Various Artists

French dance compilation, Olivia duets with Francis Lalanne on You're The One That I Want

Music From The Park Music From The Park

(1996)
Various Artists

Part of Your World sung by Olivia

John Denver's The Rocky Mountain Collection John Denver's The Rocky Mountain Collection

(1996)

Olivia duets on the 1975 track Fly Away (this can be found on some other John Denver Greatest Hits compilations)

Mother And Child Mother And Child

(1995)
Various Artists

Olivia sings Christmas Never Felt Like This

Heathcliff - Cliff Richard Heathcliff - Cliff Richard

(1995)

Olivia guests on 5 tracks of this Cliff Richard album

Grammy's Greatest Moments Volume 3 Grammy's Greatest Moments Volume 3

(1994)
Various Artists

Hopelessly Devoted To You live from the 21st Grammys, Feb 1979

Spirit Of Christmas Spirit Of Christmas

(1994)
Various Artists

Olivia sings 'Away in a Manger'

Die Top 70er Schlager 1974-1975 Die Top 70er Schlager 1974-1975

(1993)
Various Artists

German CD featuring Olivia singing 'Long Live Love' in German

Pop Inside the Sixties Pop Inside the Sixties

(1993)
Various Artists

This various artists CD was notable for the fact that the very first two tracks recorded by Olivia for Decca in 1966 on a one-off single with the tracks 'Till You Say You'll Be Mine' and 'For Ever'.

Earthrise Earthrise

(1992)
Various Artists

Olivia features on 'Spirit of the Forest' though not it's not easy to hear her

James Reyne James Reyne

(1987)

Olivia on backing vocals on 'Hammerhead'

David Foster David Foster

(1986)

Olivia duets with David on Best of Me

Now Voyager - Barry Gibb Now Voyager - Barry Gibb

(1984)

Olivia sings on the lovely Duet 'Face To Face' and she sings backup on 'Fine Line'

Cliff Richard Live Cliff Richard Live

(1982)

Olivia and Pat Carroll provide backing on this recording from Cliff's 1972 concert in Tokyo, Japan

A Gift of Song A Gift of Song

(1979)
Various Artists

Olivia sings with Andy Gibb on 'Rest Your Love on Me' and her own song 'The Key'

Marvin and Farrar Marvin and Farrar

(1973)

Olivia plays recorder on one track, does not sing on this album

Easybeats Absolute Anthology 1965-1969 Easybeats Absolute Anthology 1965-1969

(1969)

backing vocals on Come In You'll Get Pneumonia

From Hank, Bruce, Brian and John From Hank, Bruce, Brian and John

(1967)

The Shadows (Olivia sings one line on The Day I Met Marie)