  We present optical photometric and spectroscopic results of supernova SN
2004ab, a highly reddened normal type Ia supernova. The total reddening is
estimated as $E(B-V)$ = 1.70 $\pm$ 0.05 mag. The intrinsic decline rate
parameter, $\Delta m_{15}(B)_\text{true}$ is 1.27 $\pm$ 0.05, and $B$-band
absolute magnitude at maximum $M_{B}^{\text{max}}$ is $-$19.31 $\pm$ 0.25 mag.
The host galaxy NGC 5054 is found to exhibit anomalous extinction with very low
value of $R_V$ = 1.41 $\pm$ 0.06 in the direction of SN 2004ab. Peak bolometric
luminosity is derived as $\log L_\text{bol}^\text{max}$ = 43.10 $\pm$ 0.07
erg\,s$^{-1}$. The photospheric velocity measured from absorption minimum of
Si\,{\sc ii} $\lambda$6355 line shows a velocity gradient of $\dot{v}$ = 90
km\,s$^{-1}$\,d$^{-1}$, indicating that SN 2004ab is a member of the high
velocity gradient (HVG) subgroup. The ratio of strength of Si\,{\sc ii}
$\lambda$5972 and $\lambda$6355 absorption lines, $\cal R$(Si\,{\sc ii}) is
estimated as 0.37, while their pseudo equivalent widths suggest that SN 2004ab
belongs to broad line (BL) type subgroup.
