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Flexible electronics are essential for wearable setup. Due to the high nonlinear property, threshold switching (TS) selectors can effectively suppress interference currents and are compatible to large‐scale integration, enabling them to be promising for circuit applications. However, it is still a big challenge to develop flexible TS selectors with both high electrical performance and flexibility endurance due to the lack of suitable materials and processes. Organic–inorganic hybrid perovskites (OIHPs) show great potential in flexible TS selectors owing to fast ion migration, low‐temperature synthetic processes, and excellent mechanical flexibility. Here, the flexible TS selectors with an Ag/OIHP/indium tin oxide/polyethylene naphthalate structure are demonstrated by a low‐cost solution process. The devices exhibit ultrahigh endurance (10¹⁰ cycles), excellent mechanical bending stability (10⁴ times), as well as fast …