middleman (n.)

• agent
• arbitrator
• broker
• chandler
• connection
• contact
• dealer
• deputy
• distributor
• entrepreneur
• front
• go-between
• importer
• intercessor
• intermediary
• intermediate
• intermediator
• intermedium
• internuncio
• jobber
• liaison
• link
• marketer
• mediary
• mediator
• medium
• merchandiser
• merchant
• monger
• mouthpiece
• negotiant
• negotiator
• negotiatress
• negotiatrix
• ombudsman
• retailer
• shopkeeper
• spokesman
• spokeswoman
• storekeeper
• tie
• trader
• tradesman
• trafficker
• wholesaler