We present the mode identification of frequencies found in spectroscopic observations of the \gamma Doradus star HD 135825 . Four frequencies were successfully identified : 1.3150  \pm  0.0003  d ^ { -1 } ; 0.2902  \pm  0.0004  d ^ { -1 } ; 1.4045  \pm  0.0005  d ^ { -1 } ; and 1.8829  \pm  0.0005  d ^ { -1 } . These correspond to ( l , m ) modes of ( 1,1 ) , ( 2 , -2 ) , ( 4,0 ) and ( 1,1 ) respectively . Additional frequencies were found but they were below the signal-to-noise limit of the Fourier spectrum and not suitable for mode identification . The rotational axis inclination and v sin i of the star were determined to be 87 \degree ( nearly edge-on ) and 39.7 kms ^ { -1 } ( moderate for \gamma Doradus stars ) respectively . A simultaneous fit of these four modes to the line profile variations in the data gives a reduced \chi ^ { 2 } of 12.7 . We confirm , based on the frequencies found , that HD 135825 is a bona fide \gamma Doradus star .