Martin bertemu dengan aktris Amerika Gwyneth Paltrow pada tahun 2002 di panggung backstage Coldplay, sesaat setelah kematian ayah Gwyneth, Bruce Paltrow. Setahun kemudian pasangan itu menikah pada tanggal 5 Desember 2003.
putri mereka, Apple Blythe Alison Martin, lahir pada tanggal 14 Mei 2004 di London. Anak kedua mereka, Moses Bruce Anthony Martin, lahir pada 8 April 2006 di New York City.
Martin adalah vegetarian dan suka melakukan yoga. Dia tidak merokok atau minum alkohol.
| Tahun | 2002 |
| Song (s) | "Where Is My Boy",
"Your Love Means Everything, Pt. 2" |
| Artist | Faultline |
| Album | Your Love Means Everything |
| Peran | Featured vocals |
| Tahun | 2002 |
| Song (s) | "Gold in Them Hills" |
| Artist | Ron Sexsmith |
| Album | Cobblestone Runway |
| Peran | Featured vocals |
| Tahun | 2003 |
| Song (s) | "Sliding",
"Arthur" |
| Artist | Ian McCulloch |
| Album | Slideling |
| Peran | Piano,
backing vocals |
| Tahun | 2003 |
| Song (s) | "See It in a Boy's Eyes" |
| Artist | Jamelia |
| Album | Thank You |
| Peran | Pencipta,
backing vocals |
| Tahun | 2004 |
| Song (s) | "Everybody's Happy Nowadays" |
| Artist | Ash |
| Album | Orpheus |
| Peran | Backing vocals |
| Tahun | 2004 |
| Song (s) | "Gravity" |
| Artist | Embrace |
| Album | Out of Nothing |
| Peran | Writer |
| Tahun | 2004 |
| Song (s) | "Do They Know It's Christmas?" |
| Artist | Band Aid 20 |
| Album | - |
| Peran | Featured vocals |
| Tahun | 2006 |
| Song (s) | "All Good Things (Come to an End)" |
| Artist | Nelly Furtado |
| Album | Loose |
| Peran | Co-writer,
background vocals |
| Tahun | 2006 |
| Song (s) | "Beach Chair" |
| Artist | Jay-Z |
| Album | Kingdom Come |
| Peran | Producer,
featured vocals |
| Tahun | 2007 |
| Song (s) | "Homecoming" |
| Artist | Kanye West |
| Album | Graduation |
| Peran | Co-writer,
featured vocals,
piano |
| Tahun | 2009 |
| Song (s) | "Lukas",
"Fun",
"Want" |
| Artist | Natalie Imbruglia |
| Album | Come to Life |
| Peran | Co-writer |
| Tahun | 2009 |
| Song (s) | "Dove of Peace" |
| Artist | Bruno |
| Album | Bruno |
| Peran | Featured vocals |
| Tahun |
2010 |
| Song (s) |
"Most Kingz" |
| Artist |
Jay-Z |
| Album |
- |
| Peran |
Featured vocals |
