|First appearance||"Hamsterdam" (episode 3.04)|
|Last appearance||"Margain of Error" (episode 4.06)|
|Reason/Cause||End of Storyline|
|Occupation||Washington-based political consultant and campaign fixer.|
|Spouse||Jimmy McNulty (Ex-boyfriend)|
|Episode Count||15 episodes|
|Portrayed by||Brandy Burre|
Terry D'Agostino is a Washington-based political consultant and campaign fixer portrayed by Brandy Burre.
Terry graduated from the University of Maryland School of Law at the same time as councilman Tommy Carcetti. In season three, Carcetti aggressively pursues D'Agostino to work as his campaign manager for his planned run for Mayor of Baltimore. She is reluctant to work for a white candidate in a predominantly African American city, but Carcetti convinces her he is worth taking a chance on. Once on board, D'Agostino was quick to plan a strategy for the campaign. Carcetti suggested they use his colleague Anthony Gray, who was also planning to run, to split the African American voter base. D'Agostino also has a relationship with Detective Jimmy McNulty during, season three, which was strictly sexual. The relationship comes to an end after McNulty is led to believe that D'Agostino wants to get to know him, but then realized that she is merely trying to get information about Bunny Colvin and Hamsterdam from him to help the campaign.
D'Agostino arranges for Carcetti to receive coaching on his public speaking. She felt that he is too focused on winning arguments and that he should put appearing likable first. When Carcetti discovers that a police district commander, Howard "Bunny" Colvin, has created drug-tolerant zones, D'Agostino saw an opportunity to attack the current mayor, Clarence Royce, and encourages her candidate to use it. He uses this to launch into an inspiring speech, convincing many that he is a political force to be reckoned with.
In season four, the campaign is in full swing, and D'Agostino works alongside new deputy campaign manager Norman Wilson. She encourages Carcetti to become involved in fundraising, forcing him to stay in his office until he has raised set amounts. She also shields him as best she could from polling data that did not meet his expectations. D'Agostino's strategizing and Wilson's hard work on the campaign trail contribute to Carcetti's victory in the mayoral primary. D'Agostino chooses the night of his win to approach him for her "win bonus" by seducing him. When Carcetti resists her advances she is bemused but respects his wishes. D'Agostino returns to Washington with a higher profile to work for the DCCC after her success in Baltimore
Tommy Carcetti - Clarence Royce - Clay Davis - Norman Wilson - Tony Gray - Michael Steinorf - Nerese Campbell - Odell Watkins - Marla Daniels - Theresa D'Agostino - Coleman Parker - Damien Levelle Price