DFN

DFN is a three letter acronym that may refer to:

• Dehcho First Nations, one of the First Nations of North Western Canada
• Desert Fireball Network, a fireball camera network based in Australia
• Deutsches Forschungsnetz, the German national research and education network
• <dfn>, Definition HTML tag
• Differential Frequency Noise (electronics)
• Dignity Freedom Network, formerly the Dalit Freedom Network
• Direct function (dfn), a way to define a function in the APL programming language
• Discrete Fracture Network model, a mathematical representation of fracture characteristics for hydromechanical numerical calculations in geology
• Doyle-Fuller-Newman model, a physics-based model used to predict the electrochemical dynamics of lithium-ion batteries
• Dual Flat No Lead, a style of integrated circuit package