| 4S | Toshiba | 10 | LMR | Under Development |
| ABV | OKBM Afrikantov | 3-10 | PWR | Under Development |
| ACP100 | China National Nuclear Corporation (CNNC) | 100-150 | PWR | Under Development |
| Adams Engine | Adams Atomic Engines | 1-100 | HTR | Shelved |
| AHWR | Babha Atomic Research Center (BARC) | 284 | PHWR | Under Development |
| ALLEGRO | European Partners | 25 | GCFR | Conceptual Design |
| ANGSTREM | OKB Gidropress | 6 | LMR | Conceptual Design |
| ANTARES | AREVA | 285 | HTR | Conceptual Design |
| ARC-100 | Advanced Reactor Concepts, LLC | 100 | LMR | Under Development |
| BREST-OD-300 | N.A. Dollezhal Research and Development Institute of Power Engineering (NIKIET) | 300 | LMR | Under Development |
| CAREM | Comision Nacional de Energia Atomica | 25 | PWR | Licensing Stage |
| CNP-300 | Shanghai Nuclear Engineering Research and Design Institute (SNERDI) | 300 | PWR | Operating |
| EGP-6 | Teploelectroproekt | 11 | LGR | Operating |
| ELENA | Kurchatov Institute | 0.1 | PWR | Conceptual Design |
| EM2 | General Atomics | 240 | HTR | Conceptual Design |
| ENHS | University of California, Berkeley | 50 | LMR | Conceptual Design |
| FBNR | Federal University of Rio Grande do Sul | 40 | Fixed Bed | Conceptual Design |
| Flexblue | Direction des Constructions Navales Services (DCNS) | 50-250 | PWR | Conceptual Design |
| Fuji MSR | International Thorium Energy & Molten Salt Technology Inc. Company (IThEMS) | 200 | LMR | Conceptual Design |
| G4M (HPM) | Gen4 Energy, Inc. (Hyperion Power Generation) | 25 | LMR | Under Development |
| GEMSTAR | Virginia Tech and Accelerator Driven Neutron Application (ADNA) Corporation | 220 | LMR | Conceptual Design |
| General Fusion | General Fusion | 100 | Fusion Reactor | Conceptual Design |
| GT-MHR | General Atomics | 286 | HTR | Under Development |
| GTHTR | Japan Atomic Energy Agency (JAEA) | 275 | HTR | Under Development |
| HTR-PM | Institute of Nuclear Energy and New Technology (INET) at Tsinghua University & Huaneng Shandong Shidaowan Nuclear Power Company (HSSNPC) | 200 | HTR | Under Construction |
| Indian 220 MWe PHWR | Babha Atomic Research Center (BARC) | 202 | PHWR | Operating |
| IRIS | Westinghouse | 335 | PWR | Shelved |
| KLT-40S | OKBM Afrikantov | 35 | PWR | Under Construction |
| LFTR | Flibe Energy | n/a | LMR | Conceptual Design |
| LSPR | Tokyo Institute of Technology | 53 | LMR | Conceptual Design |
| MARS | Kurchatov Institute | 6 | LMR | Conceptual Design |
| mPower | B&W Company and Bechtel Power Corporation | 180 | PWR | Under Development |
| MRX | Japan Atomic Energy Research Institute (JAERI) - Mitsubishi Heavy Industries (MHI) | 30 | PWR | Conceptual Design |
| MTSPNR (GREM) | N.A. Dollezhal Research and Development Institute of Power Engineering (NIKIET) | 2 | HTR | Conceptual Design |
| NHR-200 | Institute of Nuclear Energy and New Technology (INET) at Tsinghua University | 65 | PWR | Under Development |
| NIKA-70 | N.A. Dollezhal Research and Development Institute of Power Engineering (NIKIET) | 15 | PWR | Conceptual Design |
| NP-300 | Technicatome (AREVA) | 100-300 | PWR | Conceptual Design |
| NuScale | NuScale Power Inc. | 45 | PWR | Under Development |
| PBMR | PBMR (Pty) Ltd. | 165 | HTR | Shelved |
| PEACER | Nuclear Transmutation Energy Research Centre of Korea (NUTRECK) | 300/550 | LMR | Conceptual Design |
| PRISM | General Electric-Hitachi | 311 | LMR | Under Development |
| RADIX | Radix Power and Energy Corporation | 10-50 | PWR | Under Development |
| RAPID | Central Research Institute of Electric Power Industry (CRIEPI) | 1 | LMR | Conceptual Design |
| RITM-200 | OKBM Afrikantov | 55 | PWR | Under Development |
| RUTA-70 | N.A. Dollezhal Research and Development Institute of Power Engineering (NIKIET) | n/a | PWR | Conceptual Design |
| SAKHA-92 | OKBM Afrikantov | 1 | PWR | Conceptual Design |
| SmAHTR | Oak Ridge National Laboratory (ORNL) | 50+ | FHR | Conceptual Design |
| SMART | Korea Atomic Energy Research Institute (KAERI) | 100 | PWR | Licensed |
| SMR-160 (HI-SMUR) | Holtec | 160 | PWR | Under Development |
| STAR | Argonne National Laboratory | 10-100/178 | LMR | Conceptual Design |
| SVBR-100 | OKB Gidropress/Eastern-European chief research and project institute of energy technologies (VNIPIET) | 101.5 | LMR | Licensing Stage |
| TPS | General Atomics | 16.4 | PWR | Conceptual Design |
| TWR | TerraPower | 500/1,150 | TWR | Conceptual Design |
| UNITERM | N.A. Dollezhal Research and Development Institute of Power Engineering (NIKIET) | 1.5 | PWR | Conceptual Design |
| VBER-300 | OKBM Afrikantov | 295 | PWR | Licensing Stage |
| VK-300 | N.A. Dollezhal Research and Development Institute of Power Engineering (NIKIET) | 150-250 | BWR | Shelved |
| VKT-12 | OKB Gidropress | 12 | BWR | Shelved |
| VVER-300 | OKB Gidopress | 300 | PWR | Conceptual Design |
| Westinghouse SMR | Westinghouse | 225+ | PWR | Under Development |