There are usually not requirements for specific study areas for a bachelor's degree for admittance into law school.  However, this is specific to the particular law school to which you apply -- so check their specific criteria for more information.

Popular areas of study for a bachelor's degree in preparation for law school include English, Political Science and Business.  However, some attorneys who work with technical fields, like patents, have technical or engineering degrees. 

The important part about selecting an area of study for a bachelor's degree is to make sure that you enjoy the subject area and will be interested enough in it to get good grades and graduate.