Most international students will need either a general student visa (Tier 4) or a Short-term Study Visa. If your country is a member of the European Economic Area you will not need a Tier 4 visa to study in the UK. This includes all 28 EU countries and three none-EU countries.
Applying for a general student visa (Tier 4)
If your course is six months or shorter you will need a short-term visa.