LDE may refer to:
- Long delayed echo, radio echoes which return to the sender several seconds after a radio transmission has occurred
- Lodhikheda railway station, the station code LDE
- Tarbes–Lourdes–Pyrénées Airport, the IATA code LDE
- LADE, the ICAO code LDE
- Leipzig-Dresdner Eisenbahn-Compagnie, a company that opened Riesa station
- LDE(x), the LiteStep distribution
- Liberali Democratici Europei, a liberal political party in Italy