Socialist Worker is the name of several socialist newspapers currently or formerly associated with the International Socialist Tendency (IST). It is a weekly published by the Socialist Workers Party (SWP) in the United Kingdom, a monthly (and daily web site) published by the International Socialist Organization (ISO) in the United States, a monthly published by the International Socialists in Canada, a biweekly published by the Socialist Workers Party in Ireland, a quarterly published by the International Socialist Organisation in Zimbabwe and was a monthly published by the former International Socialist Organisation in Australia.