| NNA | Named Network Algorithm 
| Others |
| NNA | National NeighborWorks Association
| Others |
| NNA | National Nephrology Associates
| Others |
| NNA | National Nertz Association
| Others |
| NNA | National News Agency
| Agency, Government, News |
| NNA | National Newspaper Association
| Others |
| NNA | National Notary Association
| Others |
| NNA | National numbering agency
| Others |
| NNA | Nationalist News Agency
| Others |
| NNA | Navigating the New Arctic
| Others |
| NNA | Neal Nelson Associates
| Others |
| NNA | Nearly Natural Abundance
| Others |
| NNA | Nebraska Nurses Association
| Others |
| NNA | Neomycin Nalidixic Acid
| Others |
| NNA | Net New Assets
| Others |
| NNA | Neural Network Accelerator
| Others |
| NNA | Neurology Neuroscience Associates
| Others |
| NNA | Nevada Nurses Association
| Others |
| NNA | New Nicotine Alliance
| Others |
| NNA | New Note Action
| Others |
| NNA | News Network Anthroposophy
| Others |
| NNA | Nexon North America
| Others |
| NNA | Next Node Address
| Others |
| NNA | Nickel Nation Amusements
| Others |
| NNA | Nissan North America
| Others |
| NNA | Node Numbering Agent
| Others |
| NNA | Non Native Americans
| Others |
| NNA | Northcenter Neighborhood Association
| Others |
| NNA | Northern Nevada Aquatics
| Others |
| NNA | Number of Non Adaptive
| Others |