Under　intermittent　noncollocated　boundary　measurement　(BM),　this　article　introduces　a　dynamic　intermittent　boundary　output-feedback　control　for　reaction–diffusion　systems　(RDSs).　Since　the　system　state　is　not　fully　available　and　intermittent　noncollocated　BM　makes　the　intermittent　BC　design　very　difficult,　an　observer-based　control　technique　is　given　to　surmount　this　design　difficulty.　Initially,　a　PDE　state　observer　under　intermittent　noncollocated　BM　is　provided　to　estimate　the　RDS　state.　Then,　the　exponential　stability　of　closed-loop　RDSs　is　ensured　by　constructing　an　observer-based　controller.　Sufficient　conditions　of　such　dynamic　controller　are　subsequently　presented　by　linear　matrix　inequalities　(LMIs)　via　employing　a　switching　time-dependent　LF　and　inequality　techniques.　Finally,　two　numerical　examples　are　presented　to　demonstrate　the　effectiveness　of　the　proposed　design　approach.　IEEE