Abstract: The 1/2+ ground state and a 11/2- isomer of very neutron-deficient isotope 143Dy were produced by irradiation of an enriched target of 106Cd with 40Ca and studied by using a helium-jet fast tape-transport system in combination with proton-, X- and - coincidence measurements. A simple ( EC + +) decay scheme of 143mDy with a half-life of 3.0(3) s and a tentative ( EC + +) decay scheme of 143gDy with a half-life of 5.6(10) s are proposed. As a by-product, the 347- and 545-keV transitions in 138Sm following the -delayed proton emission of 139Gd decay and the 323-keV transition in 139Eu following the -delayed proton emission of 140Tb decay could be observed for the first time.