Metal-organic frameworks (MOFs) are regarded as robust, extended crystalline structures constructed from metal ions and bridging ligands via coordination bonds. In the last decade, it has been recognized that some classes of MOFs show crystal melting and glass formation. These disordered phases have opened opportunities for non-crystalline properties and functions. Transparent film/fiber and composites are fabricated using glass/liquid states. Reversible crystal-to-liquid transformation enables switching functionality and creating hetero-interfaces of crystals. I will share the latest research about the glass and liquid chemistry of MOFs from both synthetic and analysis viewpoints.