The optical absorption of Nd3+ ions in KTiOPO4 crystals grown from W-rich fluxes has been characterized in the 4.2-300 K temperature range. It has been found that the intensity of the optical absorption bands depends on the polarization state of the light (E) with regard to the crystal lattice axes (a, b, c). For E ∥ c all bands appear with maximum intensity. For E ∥ a and E ∥ b the band intensity decreases, but the spectra observed in the two configurations are inequivalent. It is suggested that several Nd centres contribute in KTP:W crystals. The segregation coefficient estimated for Nd in KTP crystals grown using W-rich flux is 5 x 10-3. being at least one order of magnitude lower in crystals grown from KTP self-flux.