This is a list of Richard Marx's session work playing various instruments and singing backing vocals for various artists.

Lionel Richie - Lionel Richie

• "You Are" (backing vocals)

Lionel Richie - Can't Slow Down

• "All Night Long" (backing vocals)
• "Running with the Night" (backing vocals)

George Benson - 20/20

• "Nothing's Gonna Change My Love for You" (backing vocals)

Chicago - Chicago 17

• "We Can Stop the Hurting" (backing vocals)

Julio Iglesias - 1100 Bel Air Place

• "Moonlight Lady" (backing vocals)

Fee Waybill - Read My Lips

• "Who Loves You Baby" (backing vocals)

Peabo Bryson - Straight from the Heart

• If Ever You're in My Arms Again (backing vocals)
• Learning the Ways of Love (backing vocals)

Whitney Houston - Whitney Houston

• "Saving All My Love for You" (backing vocals, guitars)
• "All at Once" (backing vocals, guitars)
• "The Greatest Love of All" (backing vocals, guitars)
• "Hold Me" (backing vocals, guitars)

Madonna - True Blue

• "White Heat" (backing vocals)

Barbra Streisand - One Voice

• "Somewhere" (backing vocals)
• "Evergreen" (backing vocals)
• "Something's Coming" (backing vocals)
• "People" (backing vocals)
• "Send In the Clowns" (backing vocals)
• "Over the Rainbow" (backing vocals)
• "Guilty" (backing vocals)
• "What Kind of Fool" (backing vocals)
• "Papa, Can You Hear Me?" (backing vocals)
• "The Way We Were" (backing vocals)
• "It's a New World" (backing vocals)
• "Happy Days Are Here Again" (backing vocals)
• "America the Beautiful" (backing vocals)

Vixen - Vixen

• "Edge of a Broken Heart" (keyboards)

Michael Bolton - Soul Provider

• "Soul Provider" (backing vocals)

Billy Joel - Storm Front

• "That's Not Her Style" (backing vocals)
• "Storm Front" (backing vocals)

Tim Feehan - Full Contact

• "Heart in Pieces" (backing vocals)

John Farnham - Then Again

• "The Reason Why" (piano)

Michael Bolton - Greatest Hits (1985–1995)

• "Soul Provider" (backing vocals)

Amy Sky - Cool Rain

• "Til Tomorrow" (backing vocals)

Fee Waybill - Don't Be Scared By These Hands

• "I Know You" (backing vocals)
• "Tall Dark and Harmless" (backing vocals)
• "Shut Up and Love Me" (backing vocals)
• "The Swing of Things" (backing vocals)
• "Fools Cry" (backing vocals)
• "Surprise Yourself" (backing vocals)
• "I've Seen This Movie Before" (backing vocals)
• "What's Wrong with That" (backing vocals)
• "Somewhere Deep Inside" (keyboards)

Sarah Brightman - Eden

• The Last Words You Said (backing vocals)

Barbra Streisand - A Love Like Ours

• "If You Ever Leave Me" (Duet with Vince Gill) (keyboards)

Natalie Cole - Greatest Hits-Volume 1

• "Angel on My Shoulder" (backing vocals)

Barry Mann - Soul and Inspiration

• "Rock and Roll Lullaby" (backing vocals)

Kenny Rogers - There You Go Again

• "Crazy Me" (backing vocals)
• "I Do It for Your Love" (backing vocals, keyboards)

Natalie Cole - Love Songs

• "Angel on My Shoulder" (backing vocals)

Josh Groban - Josh Groban

• "To Where You Are" (keyboards, piano)

Michael Bolton - Only a Woman Like You

• "Slowly" (backing vocals)
• "I Surrender" (backing vocals, keyboards)
• "Eternally" (backing vocals, keyboards)

Chris Botti - December

• "Have Yourself a Merry Little Christmas" (backing vocals)

Marie Sisters - Marie Sisters

• "I Will Hold On" (strings)
• "If I Fall in Love Tonight" (backing vocals)

Olivia Newton-John - 2

• "Never Far Away" (Duet with Richard Marx) (keyboards)

Barbra Streisand - Duets

• "If You Ever Leave Me" (Duet with Vince Gill) (keyboards)

Chicago - The Box

• "We Can Stop the Hurting" (backing vocals)

Billy Ray Cyrus - The Other Side

• "Tip of My Heart" (backing vocals)

Kenny Loggins - It's About Time

• "With This Ring" (backing vocals, keyboards)
• "I Miss Us" (backing vocals, keyboards)
• "The One That Got Away" (acoustic piano)

Kristy Starling - Kristy Starling

• To Where You Are (keyboards)

Luther Vandross - Dance with My Father

• "Dance with My Father" (keyboard and drum programming)

Sissel - My Heart

• Someone Like You (all instruments)
• Beyond Imagination (backing vocals, keyboards, drum programming)

Disney's Happiest Celebration on Earth: 50 Years

• LeAnn Rimes - "Remember When" (piano, keyboards, backing vocals)

Sister Hazel - Absolutely

• "Meet Me in the Memory" (keyboards))

Luther Vandross - The Ultimate Luther Vandross

• "Dance with My Father" (keyboards and drum programming)

Kenny Loggins - How About Now

• "I'll Remember Your Name" (backing vocals, acoustic guitar)

New Music from an Old Friend

• Kenny Loggins - "I'll Remember Your Name" (backing vocals, acoustic guitar)

George Canyon - What I Do

• "Just Like You" (backing vocals)
• "Pretty Drunk Out Tonight" (backing vocals)
• "All or Nothing" (backing vocals)
• "Let It Out" (backing vocals)
• "In Your Arms Again" (arranger, piano, strings)
• "Back to Life" (backing vocals)
• "Betty's Buns" (backing vocals)
• "If I Was Jesus" (backing vocals)
• "What I Do" (arranger, strings)
• "Last Man" (backing vocals)
• "I Believe in Angels" (backing vocals)

Katherine Jenkins - Believe

• "Fear of Falling" (backing vocals)

Red - Innocence & Instinct

• "Out from Under" (backing vocals)

Vertical Horizon - Burning the Days

• "Here" (piano)

Ringo Starr - Y Not

• "Mystery of the Night" (backing vocals)

Rhonda Vincent - Taken

• "Taken" (backing vocals)

Heart

• All Through the Night (backing vocals)

Vertical Horizon - Echoes from the Underground

• "You Never Let Me Down" (piano, backing vocals)
• "Evermore" (backing vocals)
• "Song for Someone" (backing vocals)
• "Consolation" (backing vocals)

Heart - Home for the Holidays

• All Through the Night - (vocals)

Ringo Starr - Postcards from Paradise

• "Right Side of the Road" (backing vocals)
• "Not Looking Back" (guitars, backing vocals)

Vertical Horizon - The Lost Mile

• "I'm Not Running" (backing vocals)

Matt Nathanson - Postcards (from Chicago)

• "Surrender" (Duet with Richard Marx)

Fee Waybill - Rides Again

• "Faker" (background vocals)
• "How Dare You" (guitar, bass, keyboards, background vocals)
• "Don't Want to Pull the Trigger" (background vocals)
• "Say Goodbye" (acoustic guitar, keyboards, background vocals)
• "Promise Land" (guitar, bass, keyboards, background vocals)
• "Man Of the World" (guitar, keyboards, background vocals)
• "Still You on the Inside" (guitar, keyboards, background vocals)
• "Woulda Coulda Shoulda" (bass, keyboards, background vocals)
• "Meant To Be Alone" (background vocals)