The octopus project may be:

• The Octopus Project, an American indietronica band based in Austin, Texas
• Octopus (software), a software package for density-functional theory (DFT)

• Nelsons Homeopathic Pharmacy
• Nelsons (homeopathy)
• Nelson's Ice Cream
• Nelson Siding, Oregon
• Nelson Sing
• Nelson's Kangaroo Rat
• Nelson's Milksnake
• Nelson Solorzano
• Nelson Solórzano
• Nelson Somerville Rulison
• Nelson Soto
• Nelson's Pauraque
• Nelson's pinyon
• Nelson's Pocket Mouse
• Nelson S. Román
• Nelson's sharp-tailed sparrow
• Nelson's Small-eared Shrew
• Nelson's Sparrow
• Nelson's Spiny Pocket Mouse
• Nelson Stamler
• Nelson station (British Columbia)
• Nelson Stephen Román
• Nelson Stokes
• Nelson Stokley
• Nelson Stoll