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Top Countries Leading the Global Submarine Fleet in 2025
Russia and the United States Tie at the Top with 66 Submarines Each
In a surprising yet expected turn, Russia and the United States dominate the global submarine landscape with an equal number of 66 submarines each, maintaining their superpower status. Both nations continue to invest heavily in their underwater fleets, considering submarines a vital component of their strategic defense and power projection capabilities. Russia’s older but numerous classes of submarines are complemented by advancements in missile technology, while the U.S. focuses on modern stealth and missile systems. These fleets form a crucial part of their respective nuclear triads, ensuring second-strike capability remains intact.
China Climbs Close with 61 Submarines, Strengthening Its Naval Presence
Following the two giants is China, boasting a fleet of 61 submarines. China’s rapid naval expansion underscores its ambitions to project power across the Indo-Pacific region and challenge Western naval dominance. The People’s Liberation Army Navy has been modernizing its fleet, phasing out older vessels and introducing advanced diesel-electric and nuclear submarines. This increased submarine count aligns with China’s efforts to secure strategic choke points and dominate critical maritime trade routes.
Iran and North Korea Continue Naval Buildup with Small but Significant Fleets
Iran has increased its submarine count to 25, mainly focusing on domestically produced vessels and upgraded versions of older models. Iran’s submarine fleet is viewed as a deterrent in the Persian Gulf, where regional conflicts are frequent.
Meanwhile, North Korea maintains a fleet of 24 submarines, predominantly smaller and older models. The regime emphasizes submarine patrols and asymmetric warfare tactics, aiming to challenge US and South Korean naval assets in the region.
Japan and South Korea Bolster Regional Defense with Submarines
Japan operates 23 submarines, emphasizing stealth and technological advancements to maintain a credible deterrent against regional threats. Japan’s submarine fleet is considered one of the most sophisticated in the world, utilizing state-of-the-art sensors and weapons.
South Korea follows closely with 22 submarines, underlining its focus on countering North Korean missile and submarine threats. Both nations benefit from ongoing collaborations, with recent upgrades treating their fleets to the latest maritime defense systems.
India and Turkey Expand Maritime Capabilities
India has steadily increased its submarine strength, now operating 18 vessels. The Indian Navy’s strategic focus includes securing the Indian Ocean and countering Chinese influence, investing heavily in indigenous submarine production and regional collaborations.
Turkey maintains 14 submarines, primarily diesel-electric models, reflecting its regional ambitions and NATO partnership commitments.
Western Nations and Middle Eastern Countries Maintain Submarine Numbers
The United Kingdom operates a formidable fleet of 10 submarines, primarily nuclear, ensuring its nuclear deterrent remains credible post-Brexit.
France and Greece both maintain 9 submarines each, with France focusing on nuclear submarines and Greece bolstering its regional maritime security amid tensions in the Eastern Mediterranean.
Egypt and Italy both operate 8 submarines, emphasizing regional security and NATO cooperation.
Pakistan maintains a fleet of 8 submarines, with recent acquisitions aimed at countering Indian maritime influence.
Smaller but Notable Submarine Fleets Around the World
Other countries like Algeria, Australia, and Brazil each operate 6 submarines, focusing on regional security, with Australia notably upgrading its fleet to counter regional tensions in the Indo-Pacific.
Germany, Israel, Norway, Peru, Singapore, and Vietnam each operate six submarines, highlighting their roles in regional security and strategic alliances.
Countries with smaller fleets include Azerbaijan, Canada, Chile, Colombia, Indonesia, Sweden, and Taiwan, each with 4 submarines, emphasizing their maritime defense priorities.
Minimal Presence: Countries with 1-3 Submarines
Nations like Myanmar, the Netherlands, South Africa, and Venezuela maintain 3 or fewer submarines. Larger countries like Argentina, Bangladesh, Ecuador, Malaysia, Portugal, Spain, and Poland maintain even smaller fleets, typically focusing on regional security and strategic deterrence.
This detailed snapshot of global submarine capabilities in 2025 highlights the ongoing competition for underwater dominance, critical amid shifting geopolitical tensions worldwide. As nations continue to modernize and expand their underwater assets, submarine fleets remain at the core of strategic military planning.
Source: Global Fire Power 2026
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