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洛斯阿拉莫斯國家實驗室 Los Alamos National Laboratory，LANL  
洛斯阿拉莫斯國家實驗室（Los Alamos National Laboratory，LANL，曾被稱為洛斯阿拉莫斯實驗室、洛斯阿拉莫斯科學實驗室），隸屬美國能源部的國家實驗室，位于新墨西哥州的洛斯阿拉莫斯 (新墨西哥州)。
1945年7月，該實驗室研制首枚原子彈，曼哈頓計劃的所在地，在冷戰時扮演美國軍事研究的重要基地。實驗室目前是全球最大的跨學科研究機構之一。它是新墨西哥州北部最大的研究機構和雇員最多的機構，約有10,400名加利福尼亞大學雇員，以及大約2,800名合同雇員。
實驗室約三分之一的技術人員是物理學專家、四分之一是工程師、六分之一是化學和材料專家，其余的工作在數學和計算科學、生物科學、地質科學等其他學科。也有外部的專家和學生來實驗室做訪問研究工作。實驗室聯合大學和工業界進行能源方面的基礎和應用研究。實驗室年度預算約為22億美元。
洛斯阿拉莫斯是美國設計核武器的兩個機構之一，另一個是勞倫斯利福摩爾國家實驗室（始于1952年）。
不過，該實驗室近年出現多宗丑聞，包括遺失機密數據、錯誤起訴一名華人科學家李文和充當間諜，2004年實驗室需要大規模重組，2006年6月，多年來一直營運實驗室的加州大學交出管理權，實驗室交由新成立的“洛斯阿拉莫斯國家安全委員會”全面接手，成員包括加州大學及多間軍火營辦商，新委員會的目標將要令實驗室盈利。

Los Alamos National Laboratory (or LANL; previously known at various times as Project Y, Los Alamos Laboratory, and Los Alamos Scientific Laboratory) is one of two laboratories in the United States where classified work towards the design of nuclear weapons is undertaken. The other, since 1952, is Lawrence Livermore National Laboratory. LANL is a United States Department of Energy (DOE) national laboratory, managed and operated by Los Alamos National Security (LANS), located in Los Alamos, New Mexico. The laboratory is one of the largest science and technology institutions in the world. It conducts multidisciplinary research in fields such as national security, space exploration, renewable energy,[2] medicine, nanotechnology, and supercomputing.
LANL is the largest institution and the largest employer in northern New Mexico, with approximately 9,000 direct employees and around 650 contractor personnel.[3] Additionally, there are roughly 120 DOE employees stationed at the laboratory to provide federal oversight of LANL's work and operations. Approximately one-third of the laboratory's technical staff members are physicists, one quarter are engineers, one-sixth are chemists and materials scientists, and the remainder work in mathematics and computational science, biology, geoscience, and other disciplines. Professional scientists and students also come to Los Alamos as visitors to participate in scientific projects. The staff collaborates with universities and industry in both basic and applied research to develop resources for the future. The annual budget is approximately US$2.2 billion.