ARD 1 Plus was a German cultural television channel, which was broadcast as an offshoot of Das Erste from 29 March 1986 to 30 November 1993.

[1] 1 Plus also served as the test channel for European HDTV development HD-MAC, which made good progress until the live broadcast of the 1992 Summer Olympics in Barcelona, but was then unable to receive European funding under pressure from the United Kingdom government.

For cost reasons and the broadcaster's impending inclusion as a cooperative member for the existing cultural channel 3sat at that time, ARD decided to close 1 Plus on November 30, 1993.

1 Plus was broadcast terrestrially via cable and satellite, as well in Saarland (Saarbrücken) and in Bremen via antenna.

1 Plus was received via satellite via Astra 1B, DFS Kopernikus and in D2-MAC via TV-SAT 2 until the channel closed.