The paper introduces the Universal FeynRules Output (UFO), a new model format designed for automated matrix-element generators. UFO is universal in that it is compatible with multiple generators and is flexible, modular, and agnostic to assumptions about the number of particles or the color and Lorentz structures in interaction vertices. Unlike other formats that require text files to be parsed, UFO encodes model information into a Python module, which can be easily linked to other computer codes. The paper describes an interface for the MATHEMATICA package FEYNRULES that allows for automatic output of models in the UFO format. The UFO format is detailed, including the definition of particles, parameters, and vertices, and its implementation in the FEYNRULES package is discussed. The paper also covers the extension of UFO to include higher-dimensional operators and non-standard color structures, and provides an example of implementing the Strongly Interacting Light Higgs (SILH) model using UFO.The paper introduces the Universal FeynRules Output (UFO), a new model format designed for automated matrix-element generators. UFO is universal in that it is compatible with multiple generators and is flexible, modular, and agnostic to assumptions about the number of particles or the color and Lorentz structures in interaction vertices. Unlike other formats that require text files to be parsed, UFO encodes model information into a Python module, which can be easily linked to other computer codes. The paper describes an interface for the MATHEMATICA package FEYNRULES that allows for automatic output of models in the UFO format. The UFO format is detailed, including the definition of particles, parameters, and vertices, and its implementation in the FEYNRULES package is discussed. The paper also covers the extension of UFO to include higher-dimensional operators and non-standard color structures, and provides an example of implementing the Strongly Interacting Light Higgs (SILH) model using UFO.