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| K745 Blue Shark K745 청상어 경어뢰 | |
|---|---|
A scale model of a Blue Shark lightweight torpedo | |
| Type | Lightweight ASW torpedo |
| Place of origin | South Korea |
| Service history | |
| Used by | See Operators |
| Production history | |
| Designer | Agency for Defense Development |
| Designed | 1995 |
| Manufacturer | LIG Defense & Aerospace |
| Produced | 2005–present |
| Specifications | |
| Mass | 280 kg |
| Length | 2.7 m |
| Width | 0.32 m |
Operational range | 19 km |
| Maximum speed | 45+ knots (83+ km/h) |
Guidance system | Acoustic |
Launch platform | Vessel / aircraft / helicopter |
The K745 Blue Shark (Korean: 청상어; RR: Cheong-sang-eo) is a lightweight anti-submarine torpedo developed for the Republic of Korea Navy in 2004.

The Blue Shark torpedo can be deployed from surface ships, ASW helicopters and maritime patrol aircraft. Production cost for each torpedo is about ₩ 1,000,000,000.
Blue Shark torpedoes are fitted to the Incheon, Daegu- and Chungnam classes of frigates as well as to the Sejong the Great-class of destroyers. It is exported to the Philippines as part of the acquisition process for both the Jose Rizal-class, and Miguel Malvar-class frigates and Augusta-Westland AW159 helicopters.
An improved variant, the lightweight torpedo-2 is being developed by LIG Nex1. New capabilities include longer range and lesser vulnerability to decoys. The research and development program is expected to be completed in 2029.
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