SD1 or SD-1 may refer to:
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South Dakota's 1st congressional district, a United States electoral district
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British NVC community SD1, the only shingle community in the British National Vegetation Classification system
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MSD SD-1, a floppy disk drive station for Commodore computers
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Panasonic HDC-SD1, a digital camcorder
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Sigma SD1, a digital SLR camera
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Rover SD1
The Rover SD1 is both the code name and eventual production name given to a series of executive cars built by the Specialist Division (later the ''Jaguar-Rover-Triumph'' division) of British Leyland (BL), under the Rover marque. It was produ ...
, a British car built between 1976 and 1986
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Spacek SD-1 Minisport
The Spacek SD-1 Minisport is a Czech amateur-built aircraft, designed by Igor Špaček and produced by Spacek sro of Hodonin. The aircraft was also produced for a short time in the United States by SkyCraft Airplanes of Orem, Utah as a li ...
, a Czech amateur-built aircraft design
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Northrop SD-1 drone, a battlefield reconnaissance drone of the 1960s
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SD1 (gene), a gene that may be part of the
agricultural weed syndrome The agricultural weed syndrome is the set of common traits which make a plant a successful agricultural weed. Most of these traits are not, themselves, phenotypes but are instead methods of rapid adaptation. So equipped, plants of various origins - ...
of ''Oryza sativa'' and ''O. rufipogon'' weeds
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