This Practice Note provides an overview of joint employment relationships. It discusses the tests applied to determine whether a joint employer relationship exists under the National Labor Relations Act (NLRA), the Fair Labor Standards Act (FLSA), Title VII of the Civil Rights Act of 1964 (Title VII), and the Family and Medical Leave Act (FMLA). It also discusses the risks of being a joint employer and related best practices. It addresses federal law, but is useful to employers in all states.