BLD could refer to:

• Baildon railway station, England; National Rail station code BLD.
• Ballard Power Systems; Toronto Stock Exchange symbol BLD.
• The Beer Looter Dude
• Beresfield railway station, New South Wales, Australia; station code BLD.
• Bharatiya Lok Dal
• Blue Lambency Downward, an album by experimental band Kayo Dot
• Boral; Australian Securities Exchange symbol BLD.
• Boulder City Municipal Airport, Nevada, United States; IATA airport code BLD.
• BLD, a computer building service by NZXT

• 2d Fighter Interceptor Training Squadron
• 2d Fighter Reconnaissance Squadron
• 2d Fighter Squadron
• 2d Fighter Weapons Squadron
• 2D Filters
• 2dF instrument
• 2d fir and iir filter
• 2D gel analysis software
• 2D geometric primitive
• 2D Goggles
• 2D (Gorillaz)
• 2D (Gorillaz member)
• 2d Guided Missiles Squadron
• 2 Die 4
• 2-diethylaminoethanol
• 2-Diethylaminoethanol
• 2-Diethylaminoethyl alcohol
• 2-dimensional polytope
• 2-dimethylaminoethanol
• 2-Dimethyl-cis-2-dimethylcarbamoyl-1-methylvinylphosphate
• 2d Infantry Division (United States)
• 2d Interceptor Command
• 2-Diphenylphosphinobenzaldehyde
• 2dis
• 2. (disambiguation)