Abstract: Advanced High Strength Steel (AHSS)s are being widely used in automobile industries for light-weighting applications. Forming of these steel grades into complex shapes is challenging due to lower formability and moreover, many grades of AHSS have poor stretch flangeability. Stretch flangeability refers to the ability of the steel to resist through-thickness edge cracking during a hole expansion or stretch flanging operation. The current study investigates the influence of hole preparation technique and hole edge quality on the stretch flangeability of a Dual Phase (DP 600) steel. For obtaining different hole edge quality, holes were created using various processes, and subsequently, the edges modified to achieve smooth and rough surfaces. Punching, fine piercing and Electric Discharge Machining (EDM) were employed to produce the holes. Quality of hole edges has been characterised by surface roughness and hardness. Hole expansion testing was conducted as per IS/ on all the samples with smooth, rough and unaltered holes for two different burr orientations. The hole expansion ratios (HER) obtained were correlated with the surface quality parameters. The surface roughness of EDM hole edge influences the HER, whereas strain hardening at the hole edge was found to be a determining factor for HER of sheared holes. Moreover, an increase of 39% observed on HER when the sample with burr oriented towards the bottom is expanded. The crack formation and the number of microcracks developed were also found to vary for the different hole conditions.