A Fourier transform spectrum has been recorded of a H2O/D2O vapor mixture in the wavenumber range 16, 300 to 22, 800 cm−1 using a long path cell. 410 lines of HDO are assigned to the OH stretching overtone bands 5v3, 6v3 and 7v3 plus combination bands. Assignments for the 6v3 and 7v3 bands represent the first data for the 006 and 007 states and give band origins of 19, 836.88 cm−1 and 22, 625.50 cm−1, respectively. Rotational term values for these states are also obtained.