Michael Lynch is a British-Irish trade unionist who has served as the General Secretary of the UK's National Union of Rail, Maritime and Transport Workers since May 2021. Since the high-profile rail strikes of 2022-2023, Lynch has become a spokesperson and symbol for the wider trade unionist movement.

The National Union of Rail, Maritime and Transport Workers is a British trade union covering the transport sector. Its current President is Alex Gordon and its current General Secretary is Mick Lynch.