Julianna Cox is a fictional character in the TV show Homicide: Life on the Street for seasons 5 and 6, played by actress Michelle Forbes.

She did not tolerate sloppy work or incompetence, and she fired two of her staff members - one who deliberately mis-classified a prostitute's murder as a drug overdose, and a second who stole jewelry from several homicide victims.

Both in need of comfort, they had a one-night stand that turned into a very open, laid-back sort of pseudo-relationship which mostly consisted of them getting drunk and having sex.

Tim Bayliss, although she later admitted that it was mostly wanting someone over the holidays, and she angrily ended any relationship when he returned a pair of earrings to her in front of everyone at a crime scene.

She returned in Homicide: The Movie to help the detectives catch a man who tried to assassinate Al Giardello, who had been their shift commander during the series.