We use photometry in the F220W,F250W,F330W,F435W filters from the High Resolution Channel of the Advanced Camera for Surveys and photometry in the F555W,F675W,and F814W filters from the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope to derive individual stellar reddenings and extinctions for stars in the HD 97950 cluster in the giant HII region NGC 3603.The mean line-of-sight reddening for about a hundred main-sequence member stars inside the cluster is E(F 435W –F 555W)= 1.33±0.12 mag.After correcting for foreground reddening,the total to selective extinction ratio is RF 555W = 3.75±0.87 in the cluster.Within the standard deviation associated with E(λ– F555W)/E(F435W – F555W)in each filter,the extinction curve in the ultraviolet and optical wavelengths inside the cluster is greyer than the average Galactic extinction laws from Cardelli et al.(1989)and Fitzpatrick et al.(1999),and closer to the extinction law derived by Calzetti et al.(2000)for starburst galaxies in which the 0.2175 μm bump is absent,indicating an anomalous extinction in the HD 97950 cluster and similar dust properties between the HD 97950 cluster and starburst galaxies.