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Samantha "Sam" Carter, USAF is a fictional character in the Canadian–American military science fiction Stargate franchise. Played by Amanda Tapping, she appears in all three shows in the franchise: Stargate SG-1, Stargate Atlantis, and Stargate Universe. She was a main character in all ten seasons of Stargate SG-1 (1997–2007). Following a recurring role in Stargate Atlantis for three seasons (2004–07), Carter became a main character in Season 4 of Atlantis (2007–08), and also appeared in the 2008 direct-to-DVD SG-1 films Stargate: The Ark of Truth and Stargate: Continuum. Amanda Tapping accepted a starring role in Sanctuary and appears in only the first and last episodes in Season 5 of Atlantis (2008–09). Carter also appears in two episodes of Season 1 of Stargate Universe.

Captain Samantha Carter first appears in "Children of the Gods", the pilot episode of Stargate SG-1, as a United States Air Force Captain who joined the fictional SG-1 team under the command of Colonel Jack O'Neill. After being promoted to Major in Season 3, Carter remains O'Neill's second-in-command until her promotion to Lieutenant Colonel early in Season 8, at which point she assumes command of the SG-1 team and O'Neill is promoted to Brigadier General in order to lead Stargate Command. Between Seasons 8 and 9 of SG-1, following the defeat of the Replicators and downfall of the Goa'uld system lords, she accepts a position as Head of the Stargate Research and Development Programme, based in Nevada. Engaged in deep-space research the Ori emerge, upon her return to Earth she is reassigned to SG-1, now under the command of Lieutenant Colonel Cameron Mitchell. Following the defeat of the Ori in Stargate: The Ark of Truth, Carter is promoted to full Colonel and appointed as commander of the Atlantis expedition early in Season 4 of Atlantis. Carter is later given command of the Daedalus-class ship, the George Hammond.

Unofficially in the online game Stargate Resistance, it is implied by visual screenshots showing a General's office with her name on the desk label that she eventually succeeds Major General Hank Landry as commander of the SGC, implying an offscreen (non-canonical) promotion to Brigadier General.

Over all, Carter is the character with the most appearances in the Stargate franchise. However, with Teal'c appearing in 213 episodes, she has the second-most appearances in Stargate SG-1 at 208.