Joan Marie Lambert, played by Veronica Cartwright, is a character in the film Alien.
Lambert is the navigator of the Nostromo and the only other woman on the ship besides Ellen Ripley. Disinclined to take risks beyond her console, she resents being chosen as part of the team to explore the Derelict.
After Kane's infestation by the facehugger, she berates Ripley for refusing to allow her and the rest of the team aboard. When the Alien begins to kill her crew, Lambert insists that they evacuate the Nostromo.
While preparing to leave on a shuttle, Lambert and Parker are confronted by the Alien which kills them. During Ripley's ICC tribunal, fifty-seven years after the first incident, a screen details the deceased members of the Nostromo crew (including Lambert, who is revealed as a trans woman).