The research explored the influence of billboard advertisement in buying products and services among pedestrians in Lagos city. The basic concern of the research was to find out whether billboard advertisement influence buying habit of consumers and to what extent. Without mincing words, it is obvious that billboard is one of the effective advertising media especially with the introduction of digital billboard that is capable of working like television with motion picture, sound among others. Survey research method was adopted and 200 copies of questionnaires were administered to 200 respondents within Lagos metropolis who were selected using accidental sampling technique. Data collected were analyzed and interpreted using table, frequency and percentage method. It was recommended that billboard should be erected in a strategic place with adequate monitoring to avoid been pulled down by the wind while reasonable font and graphics should be moderately used.