The above post on the Japan Maritime Self Defense Force mentioned the ballistic missile defense capabilities of naval warships. There are at least three users of the AEGIS and RIM-161 Standard Missile SM-3 anti-ballistic missile defense (BMD) missile currently operational, with another two countries pursuing the capability.
https://en.wikipedia.org/wiki/Aegis_...Defense_System
The U.S. Navy has 5 cruisers and 28 or more destroyers equipped for the intercept of short- and intermediate-range ballistic missiles. There is a group of these ships based in Rota, Spain for defense of NATO against missile attack. A threat of concern is North Korea and at any given time a number of BMD-capable Navy ships are active in the Western Pacific.
There are also two fixed land-based AEGIS Ashore facilities in Poland and Romania with the radar systems and missile launchers. The U.S. has considered putting a similar land-based BMD capability in Guam, which has been augmented with additional military might in recent years; Guam has the potential to be a target for Chinese or North Korean missile attack. Guam does have a U.S. Army THAAD missile battery with BMD capabilities.
The other navy to have BMD capability is the Japan Maritime Self Defense Force, which has 8 destroyers with the required systems and missiles to defend against missile attack.
The Royal Netherlands Navy is in the process of equipping 4 frigates with BMD capability, and the Republic of Korea Navy is also pursuing missile defense capability for their AEGIS missile destroyers.