Materials: Highly enriched uranium
As of July 2018, 23 countries had at least 1 kg of highly-enriched uranium in their civilian stocks. All HEU has been removed from 32 countries plus Taiwan.
More than 10000 kg: (2 countries)
- Russia
- United States
1000-10000 kg: (6 countries)
- Canada
- China
- France
- Japan
- Kazakhstan
- United Kingdom
100-1000 kg: (6 countries)
- Belarus
- Belgium
- Germany
- Italy
- Netherlands
- South Africa
10-100 kg: (3 countries)
- Israel
- North Korea
- Pakistan
1-10 kg: (4 countries)
- Australia
- India
- Iran
- Norway
About 1 kg: (2 countries)
- Nigeria
- Syria
Cleared: (33 countries plus Taiwan)
- Argentina
- Austria
- Brazil
- Bulgaria
- Czech Republic
- Chile
- Colombia
- Denmark
- Georgia
- Ghana
- Greece
- Hungary
- Indonesia
- Iraq
- Jamaica
- Latvia
- Libya
- Mexico
- Philippines
- Poland
- Portugal
- Romania
- Serbia
- Slovenia
- South Korea
- Spain
- Sweden
- Switzerland
- Taiwan
- Thailand
- Turkey
- Ukraine
- Uzbekistan
- Vietnam
Countries with research reactors that never used HEU: (11 countries)
- Algeria
- Bangladesh
- Congo (DRC)
- Egypt
- Finland
- Malaysia
- Morocco
- Peru
- Tunisia
- Uruguay
- Venezuela