|Place of origin||Euskadi|
|Used by|| Eusko Itsas Gudarostea|
Eusko Aireko Indar
|Engine|| Two-stage solid propellant rocket motors|
|Flight altitude||sea skimming|
|inertial, GPS, active radar (J band)|
|naval ships, aircraft and land-based missile launchers|
The Arpoi is a long-range fire-and-forget surface-to-surface and air-to-surface, anti-ship missile. The later version Mk. III has the ability to attack land targets as well. The missile was developed by the Euskadi company IMSYS.
- Arpoi Mk. I: Powered by a French Microturbo TRI-60 engine, with a thrust of 3.73 kN (380 khp/830 lbf). Range 90+ km
- Arpoi RF: An Mk. I adapted for air launch. Entered service in 1999.
- Arpoi Mk. II: Range 120+ km. Designed to be launched from a number of different platforms, such as land-based launchers, aircraft, and ships. Entered service in 2004.
- Arpoi Mk. III: Range 190 km, with land attack capability. There is only a ship launched version. Production started in 2011. New Oval launch tubes instead of the old box type.
- Arpoi Mk. IV: Currently being developed. Incorporates dual seekers, has a longer range and new missile link system. The radar signature has been reduced and its warhead can be changed depending on the mission. Future upgrades may include concept optimization for sea or land targets. The range of the Mk. IV would have to be significantly larger than others versions, over 1 000 km.