00

00, a double zero, may refer to:

• 00 Agent, an agent with a license to kill in the James Bond media
• 00 gauge, a standard of model railways
• Size 00, a women's clothing size in the US catalog sizes system
• Symphony No. 00 (Bruckner), an alternate name for Anton Bruckner's Study Symphony in F minor
• Mobile Suit Gundam 00, an anime series
  • 00 Gundam, a mobile suit featured in Mobile Suit Gundam 00
• 00, a common international call prefix
• 00, a wire diameter defined by the American wire gauge standard
• 00, a field on the wheel of some roulette game tables
• 00, an Italian type number for Flour
• 00, a unique squad number, notably worn by:
  • Martin Biron and John Davidson in the NHL
  • Jim Otto and Ken Burrough in the AFL
  • Robert Parish and Greg Ostertag in the NBA
  • David Reutimann in NASCAR
• A shotgun ammunition size for buckshot, about equal to 8.4 mm (.33") in diameter