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- For information dealing with this year in the timeline of the fictional Star Trek universe, see 2003.
2003
February
- 25 February
- Star Trek: Deep Space Nine: The Complete First Season is released on Region 1 DVD.
April
- 1 April
- Star Trek: Deep Space Nine: The Complete Second Season is released on Region 1 DVD.
June
- 3 June
- Star Trek: Deep Space Nine: The Complete Third Season is released on Region 1 DVD.
August
- 5 August
- Star Trek: Deep Space Nine: The Complete Fourth Season is released on Region 1 DVD.
September
- 10 September
- ENT Season 3 premieres with ENT: "The Xindi." UPN orders the series to be retitled Star Trek: Enterprise, in order to make a closer connection to the franchise.
- 15 September
- Star Trek: The Next Generation - Jean-Luc Picard Collection is released on Region 2 DVD.
October
- 7 October
- Star Trek: Deep Space Nine: The Complete Fifth Season is released on Region 1 DVD.
November
- 4 November
- Star Trek: Deep Space Nine: The Complete Sixth Season is released on Region 1 DVD.
December
- 2 December
- Star Trek: Deep Space Nine: The Complete Seventh Season is released on Region 1 DVD.
Other events
- 12 March
- Thomas Warkentin dies.
- 22 March
- Denise Lynne Roberts dies.
- 1 April
- Booker Bradshaw dies.
- 8 April
- Kathie Browne dies.
- 16 April
- Graham Jarvis dies.
- 30 April
- Jim Conners dies.
- 1 June
- Richard Merson dies.
- 11 June
- William Marshall dies.
- 21 July
- Matt Jefferies dies.
- 1 October
- Julie Parrish dies.
- 9 October
- Matt Roe dies.
- 19 October
- William Sargent dies.
- 10 November
- Margaret Armen dies.
- 13 November
- Kellie Waymire dies.
- 22 November
- Memory Alpha is launched.
- 16 December
- Madlyn Rhue dies.
- 22 December
- Wah Chang dies.
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