Photonic integration in a micrometer‐thick indium phosphide (InP) membrane on silicon (IMOS) offers intrinsic and high‐performance optoelectronic functions together with high‐index‐contrast nanophotonic circuitries. Recently demonstrated devices have shown competitive performances, including high side‐mode‐suppression ratio (SMSR) lasers, ultrafast photodiodes, and significant improvement in critical dimensions. Applications of the IMOS devices and circuits in optical wireless, quantum photonics, and optical cross‐connects have proven their performances and high potential.