BL1 could refer to:

• BL1, a postcode district in the BL postcode area
• Biosafety Level 1
• The EMD BL1, predecessor to the EMD BL2 locomotive

• 2010 IRS plane crash
• 2010 Irwin Tools Night Race
• 2010 ISF World Championship
• 2010 Islamabad plane crash
• 2010 Islamic Solidarity Games
• 2010 Isle of Man Parish Walk
• 2010 Isle of Man TT
• 2010 Isle of Wight Festival
• 2010 Islington London Borough Council election
• 2010 Israel forest fire
• 2010 Israeli Basketball League Cup
• 2010 Israeli-Lebanese clash
• 2010 Israeli–Lebanese clash
• 2010 Israel-Lebanon border clash
• 2010 Israel Open
• 2010 Israel Open - Doubles
• 2010 Israel Open - Singles
• 2010 Israel Open – Doubles
• 2010 Israel Open – Singles
• 2010 Israel wildfire
• 2010 Israel–Lebanon border clash
• 2010 ISSA Basketball Tournament
• 2010 ISSF World Shooting Championships
• 2010 Istanbul Bombing
• 2010 Istanbul bombing