- Was raised by his grandmother after he lost both parents in his early teens—his mother died from heart disease, his father died of cancer.
- Left school before his 17th birthday and spent four years apprenticing as a bookbinder, then two years working in the profession.
- Made his stage debut in the title role of the musical Secret Diary of Adrian Mole at Scotland's Byre Theatre of St. Andrews.
- Breakout role came as the hobbit Pippin in the 2001 blockbuster The Lord of the Rings: The Fellowship of the Ring, a part he reprised in both sequels.
- Got a tattoo of the word "nine" spelled out in Tengwar, a script created by Rings author J.R.R. Tolkien.
- Plays bass, drums and guitar, and also sings.
- Is a skilled fencer and martial artist.
- In 2010, starred in the Scottish musical Sunshine on Leith.
- Active in charity work, along with his band, Beecake, with Nordoff Robbins, which raises money to fund musical therapy in Scotland.
- 2002, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Nominee
- 2001, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Nominee
- 2003, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Winner
- 2004, Critics' Choice Awards — Best Acting Ensemble: Winner
- Margaret Boyd — Sister
- Alison McKinnon — Wife
- William Boyd — Father
- Mary Boyd — Mother
- Jack William Boyd — Son
- Royal Scottish Academy of Music and Drama, Glasgow, Scotland (Dramatic Arts)