The Sixth Day may refer to:

• The 6th Day, a 2000 film featuring Arnold Schwarzenegger
• Single Collection, 2004 compilation album by Gackt
• The Sixth Day and Other Tales, a collection of stories by Primo Levi, with a story titled "The Sixth Day"
• The Sixth Day (1986 film), a 1986 film directed by Youssef Chahine

• Common tickseed
• Common tiger blue
• Common-time
• CommonTime
• Commontime (album)
• Common tinsel
• Common Tinsel
• Common tit
• Common tobacco
• Common tone (chord)
• Common tone diminished seventh chord
• Common tone (key)
• Common-tone retention
• Common tone retention
• Common tone (scale)
• Common tortoise
• Common toucan
• Common Toucan
• Common Townsend daisy
• Common trade policy
• Common treebrown
• Common tree fern
• Common tree nymph
• Common tree-nymph
• Common triteleia