Class 800 may refer to:

• British Rail Class 800
• JR Freight Class EH800
• South Australian Railways 800 class
• 800 Series Shinkansen

• Black-backed robin
• Black-backed shelduck
• Black-backed sibia
• Black-backed swamphen
• Black-backed Tanager
• Black-backed Thornbill
• Black-backed Thrush
• Black-backed tody flycatcher
• Black-backed Tody-Flycatcher
• Black-backed Tody-flycatcher
• Black-backed wagtail
• Black-backed Water Tyrant
• Black-backed water-tyrant
• Black-backed Water-tyrant
• Black-backed Woodpecker
• Black bag
• Blackball ballot
• Black Ball benefit
• Black Ball Ferries
• Black Ball Ferry Line
• Black balling
• Black Balloon
• Black Balloon (disambiguation)
• Black Balloon EP
• Black Balloon Publishing