Optical　fiber　sensors　working　at　the　dispersion　turning　point　(DTP)　have　served　as　promising　candidates　for　various　sensing　applications　due　to　their　ultrahigh　sensitivity.　In　this　review,　recently　developed　ultrasensitive　fiber　sensors　at　the　DTP,　including　fiber　couplers,　fiber　gratings,　and　interferometers,　are　comprehensively　analyzed.　These　three　schemes　are　outlined　in　terms　of　operation　principles,　device　structures,　and　sensing　applications.　We　focus　on　sensitivity　enhancement　and　optical　transducers,　we　evaluate　each　sensing　scheme　based　on　the　DTP　principle,　and　we　discuss　relevant　challenges,　aiming　to　provide　some　clues　for　future　research.