Lewis Hamilton was born on 7 January 1985 in England, and was named after American sprinter Carl Lewis. Lewis Hamilton's parents separated when he was two, as a result of this he lived with his mother and half-sisters Nicola and Samantha until he was twelve, when he started living with his father.

Hamilton was educated at The John Henry Newman School. Alongside his interest for racing, he played football for his school team with current Aston Villa and England international midfielder Ashley Young.

Hamilton began karting in 1993 at the age of eight and quickly began winning races and Cadet class championships. At the age of ten he approached McLaren F1 team boss Ron Dennis for an autograph, and told him, "Hi. I'm Lewis Hamilton. I won the British Championship and one day I want to be racing your cars." Dennis wrote in his autograph book, "Phone me in nine years, we'll sort something out then." From the Cadet ranks, he progressed through to Junior Yamaha (1997) and Ron Dennis actually called him in 1998 after Hamilton won an additional Super One series and his second British championship. Dennis delivered on his promise and signed Hamilton to the McLaren driver development program. This contract included an option of a future F1 seat, which would eventually make Hamilton the youngest ever driver to secure a contract which later resulted in an F1 drive.

"He's a quality driver, very strong and only 16. If he keeps this up I'm sure he will reach F1. It's something special to see a kid of his age out on the circuit. He's clearly got the right racing mentality."
Michael Schumacher, speaking about Hamilton in 2001.

In 2001, Michael Schumacher made a one-off return to karts and competed against Hamilton along with other future F1 drivers Vitantonio Liuzzi and Nico Rosberg. Hamilton ended the final in seventh, four places behind Schumacher. Although the two saw little of each other on the track Schumacher praised the young Briton.

Due to his success in Formula Three, he moved to ASM's sister GP2 team ART Grand Prix for 2006. Just like their sister team in F3, ART were the leaders of the field and reigning champions having taken the 2005 GP2 crown with Nico Rosberg. Hamilton won the GP2 championship at his first attempt, beating Nelson Piquet, Jr. and Timo Glock.

His 2006 GP2 championship coincided with a vacancy at McLaren following the departure of Juan Pablo Montoya to NASCAR and Kimi Räikkönen to Ferrari. After months of speculation on whether Hamilton, Pedro de la Rosa or Gary Paffett would be paired with defending champion Fernando Alonso for 2007, Hamilton was confirmed as the team's second driver.