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This Recommended Practice RP-0142 was developed and published by DNV GL class society and addresses the wellhead fatigue analysis; it is based on the ongoing Structural Well Integrity Joint Industry Project (JIP) initiated in 2010. The content of this recommended practice primarily bases on the input that was received from the participants and the service provider SES, i.e. Stress Engineering Services Inc., as well as contributions from this class society. The present document has been developed during regular project meetings and workshops that involved individuals from the participants, DNV GL and external service providers. In case consensus has not been achievable, DNV GL has sought to provide acceptable compromises. Over recent decades, the complexity and duration of offshore drilling activities has steadily increased. Additionally, equipment sizes like subsea BOP stack have grown significantly. These factors have inevitably led to the significant increase of fatigue loads that the wellhead/casing system experience. The main body of the document provides operational and system description and information on system modeling and response. The appendices contain listings of inputs required for the wellhead fatigue analysis and flow charts with the examples of WFA methods.