Diode lasers in the near infrared region are used to observe overtone band transitions (upsilon = 3 <-- 0, and 6 <-- O) of the HI molecule. From spectral line shape analysis of low J transitions, quadrupole coupling constants eqQ in the upsilon = 3, and 6 vibrational states are determined to be -1948 +/- 5 and -2066 +/- MHz, respectively.