There are several ways to find a lost friend in Australia for free. You may contact your friend's family, workmates or schoolmates for example, through social networks and get information on your friend from them. You may also search your friend's name on a search engine since his or her name may appear on a social network profile, a school or workplace directory. You may also use Australia-based people finder sites that offer free services such as Pal Seeker Australia, Australian Lost School Friends and Lost Trekkers. The search may take sometime and so you may need to be a bit patient.