Single crystals of a new phosphate KCuFe(PO₄)₂ have been prepared by the flux method and its structural and physical properties have been investigated. This compound crystallizes in the monoclinic system with the space group <i>P</i>2₁/<i>n</i> and its parameters are: <i>a</i>=7.958(3) Å, <i>b</i>=9.931(2) Å, <i>c</i>=9.039(2) Å, <i>β</i>=115.59(3)° and <i>Z</i>=4. Its structure consists of FeO₆ octahedra sharing corners with Cu₂O₈ units of edge-sharing CuO₅ polyhedra to form undulating chains extending infinitely along the <i>b</i>-axis. These chains are connected by the phosphate tetrahedra giving rise to a 3D framework with six-sided tunnels parallel to the [101] direction, where the K⁺ ions are located. The Mössbauer spectroscopy results confirm the exclusive presence of octahedral Fe³⁺ ions. The magnetic measurements show the compound to be antiferromagnetic with <i>C</i>_<i>m</i>=5.71 emu K/mol and <i>θ</i>=−156.5 K. The derived experimental effective moment <i>μ</i>_<i>ex</i>=6.76<i>μ</i>_B is somewhat higher than the theoretical one of <i>μ</i>_<i>th</i>=6.16<i>μ</i>_B, calculated taking only into account the spin contribution for Fe³⁺ and Cu²⁺ cations. Electrical measurements allow us to obtain the activation energy (1.22 eV) and the conductivity measurements suggest that the charge carriers through the structure are the potassium cations.< Réduire