Richard "Ricky" Roma
The most successful salesman in the office. Although Roma seems to think of himself as a latter day cowboy and regards his ability to make a sale as a sign of his virility, he admits himself it is all luck. He is ruthless, dishonest, and immoral, but succeeds because he has a talent for figuring out a client's weaknesses and crafting a pitch that will exploit those weaknesses. He is a smooth talker and often speaks in grand, poetic soliloquies.
Shelley "The Machine" Levene
An older salesman, a once-successful salesman who has fallen on hard times and has not closed a big deal in a long time. He has a sick daughter and needs money desperately, which is why he is constantly begging Williamson for some promising sales leads.
James Lingk
A timid, middle-aged man who becomes Roma's latest client. Lingk is easily manipulated and finds Roma highly charismatic.
John Williamson
The office manager. The salesmen despise Williamson and look down on him, but need him desperately because he's the one who hands out the sales leads.
George Aaronow
An aging salesman with low self-esteem who lacks confidence and hope. A follower who lacks the ability to stand on his own.
Dave Moss
A big-mouthed salesman with big dreams and schemes. Moss resents Williamson, Mitch, and Murray for putting such pressure on him and plans to strike back at them by stealing all their best sales leads and selling them to a competitor. Moss sees Aaronow as a potential accomplice.
Baylen
a police detective. He appears in the final act to investigate the office break-in and interrogate each cast member behind closed doors.