Tommy Tanzer is a former American baseball agent who represented Major League Baseball players such as Steve Finley, John Burkett, Sterling Hitchcock, Paul Abbott, Jason Johnson, Chone Figgins, José Molina, Charlie Hayes, Dante Bichette and Shane Reynolds, Kirk Rueter, Gary DiSarcina, Dave Hollins, Stan Belinda, and managers Joe Maddon and Grady Little.
In 1998, Tanzer represented five First Round Draft picks, and in 2000, Tanzer represented six First Round picks, five of whom signed for bonuses totaling $7 million. High school pitcher Matt Harrington, was drafted with the seventh overall selection in the 2000 MLB Draft by the Colorado Rockies.
After extensive pre-draft negotiations, the Rockies allegedly agreed to a $4.95 million signing bonus. Tanzer informed the six teams picking before the Rockies that an agreement had been reached for $4.95 million and each team selected other players. The Rockies then supposedly reneged, claiming they never made the offer. Harrington and Tanzer were never able to agree to terms on a contract with the Rockies. The Rockies made a lower offer of $4 million, but Harrington opted not to sign. Harrington was selected in the second round in 2001 by the San Diego Padres, but before an agreement was reached, Harrington terminated Tanzer and signed with agent Scott Boras. Harrington, under Boras's guidance, did not sign with the Padres, and went unsigned through five more drafts, before eventually taking a $1,000 bonus to sign with the Chicago Cubs. He never made it out of Spring Training.