Parthenium  hysterophorus, is an annual herb that aggressively colonizes disturbed sites. In Pakistan, this weed is spreading very fast especially in north eastern parts of the province, Punjab. Due to lack of information on its spread, a survey was carried out in the district Rawalpindi where 8 sites were selected for sampling. The survey revealed very high density of P. hysterophorus at all sites and a total of 33 plant species were associated with P. hysterophorus. The relative density of weed in different sites of the district ranged from 8.2-64.5% while the relative frequency ranged from 14.2-29.6%. The extent of infestation was highest in denuded and fallow lands, especially in areas where soil has been disturbed. It was concluded that Parthenium is an extremely aggressive and prolific invasive weed in distract Rawalpindi and coordinated efforts are needed to manage this weed to stop its further spread.