The present study was conducted to estimate heritability and genetic and phenotypic correlations between body measurement traits and milk yield in Sahiwal cows. The body measurements and milk yield records of 310 cows were utilized. The model included fixed effects of herd, parity and stage of lactation. The herd and parity was a significant source of variation for heart girth (HG), paunch girth (PG), chest depth (CD), body depth (BD), top wedge area (TWA), front wedge area (FWA), side wedge area (SWA) and sprung at 6th rib (S6R) (P<0.001). Stage of lactation was a significant source of variation for HG, PG, BD and SWA (P<0.001). The linear and quadratic effects of age of cows were significant for FWA and SWA (P<0.001) and for sprung at last rib (SLR), PG, BD (P<0.01) and CD (P<0.05). The least squares means and standard deviations (mean±SD) for HG, PG, CD, BD, S6R, SLR, TWA, FWA and SWA were 158.7±21.39, 244.5±29.70, 65.3±3.40, 68.1±3.93, 39.8±3.71, 56.7±5.35, 1429.5±153.57, 814.5±99.97 and 2232.4±279.2 cm2, respectively. The heritability estimates for HG, PG, CD, BD, S6R, SLR, TWA, FWA and SWA were 0.84±0.02, 0.75±0.02, 0.66±0.03, 0.69±0.03, 0.70±0.03, 0.63±0.03, 0.82±0.02, 0.76±0.02 and 0.70±0.03, respectively. The HG had the highest genetic correlation with measurement day milk yield (0.29±0.00) and 305-day milk yield (0.22±0.00). All the traits were found highly heritable and could be improved through selection. The genetic correlation between some traits and milk yield was positive and considerable, so a correlated response in milk yield could result when selecting Sahiwal cows for body capacity traits.