The channeling of 300–400 KeV deuterons combined with the D(d,p)T reaction has been used to study the lattice location of deuterium in an fcc crystal of (Pd0.8Au0.2)D0.04and a bcc crystal of TaD0.10. The channeling angular distributions are measured for ⟨100⟩, ⟨110⟩, ⟨111⟩ axial and {100}, {110}, {111} planar directions. It is concluded that deuterium in Pd0.8Au0.2occupies the octahedral interstice of the fcc lattice, while that in Ta occupies the tetrahedral interstice of the bcc lattice.