IBJ

IBJ may refer to:
 * Insulated block joint: rail joint incorporating insulation to isolate individual track circuits
 * The Industrial Bank of Japan, Ltd: Japanese bank, one of the predecessors to Mizuho Financial Group
 * Indianapolis Business Journal: a business publication in Indianapolis, Indiana
 * International Bridges to Justice is a non-profit, non-governmental organization dedicated to protecting the basic legal rights of ordinary citizens in developing countries.