Events concerning the Grand Theft Auto series in 2003.
- The events of Manhunt take place.
- Madd Dogg’s album Madd Dogg: Forty Dogg, is digitally remastered.
- March 20th-May 1st: The first US invasion of Iraq.
- October 23th: James Pedeaston is tried and convicted after being arrested for child molesting in Bali, Indonesia.
- Lenny Petrovic is arrested for grand theft auto, aged 21.
- Giovanni Ancelotti is arrested for racketeering, aged 73.
- Kim Young-Guk is arrested for trademark counterfeiting, aged 25.
- Charles Martin is arrested for fraud, aged 46.
- Frenchie Fox is arrested for prostitution, aged 25.
- Angie Pegorino is arrested for possession of stolen property, aged 42.
- Gracie Ancelotti is arrested for possession of cocaine, aged 26.
- Luther Austin is arrested for assault on a police officer with a fishing pole, aged 41.
- Marlon Bridges is arrested for possession of crack cocaine, aged 16.
- Bernie Crane is arrested for loitering: prostitution solicitation, aged 25.
- Rudy D'Avanzo is arrested for fraud, aged 49.
- Vladimir Glebov is arrested for sexual assault, aged 36.
- Michael Graves is arrested for campaign finance law violation, aged 53.
- Chan Jaoming is arrested for extortion, aged 35.
- Joseph Kaplan is arrested for sexual assault, aged 28.
- Michael Keane is arrested for armed robbery, aged 23.
- Brucie Kibbutz is arrested for possession controlled substance: Steroids and speeding violation, aged 26.
- Lester Leroc is arrested for possession of cocaine, aged 41.
- Lola Del Rio is arrested for prostitution, aged 17.
- Luis Fernando Lopez is arrested for grand theft auto, aged 20.
- Cherise McCormic is arrested for driving while intoxicated, aged 33.
- Cloe Parker is arrested for driving while intoxicated, aged 19.
- Samantha Muldoon is arrested for driving while intoxicated, aged 21.
- Tom Rivas is arrested for possession controlled substance: Methaphetamine, aged 22.
- Gordon Sargent is arrested for kidnapping, aged 24.
- Don Percival founded Merryweather Security.
- Tony Prince founds Maisonette 9.
- The Lost Girl joins the The Lost MC.
- Floyd Hebert starts working at the Port of Los Santos.