LDF may mean:
- Lac du Flambeau, Wisconsin
- Left Democratic Front (Maharashtra), regional political alliance in Maharashtra, India.
- Left Democratic Front (Kerala), regional political alliance in Kerala, India.
- NAACP Legal Defense and Educational Fund
- Liberian Development Foundation
- Lietuvos Darbo Federacija, the Lithuanian Labour Federation
- Load Duration Factor (LDF) is a lumber specification defining the duration of load for a total cumulative length of time.
- Local Defence Force, former Irish Army Reserve
- Local Development Framework, spatial planning strategy introduced in England and Wales in 2004
- Log Database File, Microsoft SQL Server log file
- London dispersion force, type of intermolecular force
- Long Distance Footpath
- Leaders For Democracy Fellows Program
- Lease Direct Finance(LDF) part of the Investec Bank group of companies
- LIN Description File, LIN (Local Interconnect Network)