Downloadable Content (often abbreviated to DLC) is content that is not included with the game, but can be downloaded from the game publisher/creator. It can be free or paid, but all DLC released for RollerCoaster Tycoon is free. (The expansion packs for RollerCoaster Tycoon 1, 2 and 3 do not count as DLC.)
- The Alton Towers and Fort Anachronism scenarios were first released as DLC for the base version of RCT1 before being bundled with Loopy Landscapes.
- Several competition scenarios were released, each with the objective of "Build the best <ride name> you can!". These were the only scenarios in RollerCoaster Tycoon to have this objective. (It is technically still present in RCT2, but it's impossible to create a scenario that utilises it.)
- Three promotional scenarios were created for inclusion with magazines: PC Player, PC Gaming World and gameplay.
Many tracks would later end up in RollerCoaster Tycoon 2.
- Phobia Collection: a series of Twister Roller Coasters that all have names ending in "Phobia". 
- Cat Collection: a series of Wooden Wild Mouses that all have names starting with "Cat". 
- Beastly Collection: a collection of Looping Roller Coasters. Used to be listed on rollercoastertycoon.com. 
- Bumble Bee (also present in RCT2)
- Glow-Worm (also present in RCT2)
- Hedgehog (also present in RCT2)
- Jellyfish (also present in RCT2)
- Polar Bear
- Rat Race
- Rattlesnake (also present in RCT2)
- Stingray (also present in RCT2)
- Gem Collection: a collection of Corkscrew Roller Coasters. Used to be listed on rollercoastertycoon.com. 
- Original Collection: a collection of various ride types, all carrying girl's names. Used to be listed on rollercoastertycoon.com . 
- Brooke (Corkscrew Roller Coaster)
- Ingrid (Corkscrew Roller Coaster)
- Karen (Wooden Roller Coaster)
- Kathryn (Steel Mini Roller Coaster)
- Katie (Wooden Wild Mouse)
- Kellie (Looping Roller Coaster)
- Liz (Looping Roller Coaster)
- Louise (Steel Mini Roller Coaster)
- Margaret (Suspended Roller Coaster)
- Melanie (Inverted Roller Coaster)
- Sarah (Mine Train Coaster)
- Shona (Steel Mini Roller Coaster)
- Tamsen (Wooden Roller Coaster)
- Victoria (Stand-Up Roller Coaster)
- Woodie collection: a collection of Wooden Roller Coasters. Used to be listed on rollercoastertycoon.com. 
- Driftwood (also present in RCT2)
- Sawdust (also present in RCT2)
- Splinter (also present in RCT2)
- Tinder (also present in RCT2)
- Touchwood (also present in RCT2)
- Woodwind (also present in RCT2)
- Woodworm (also present in RCT2)
RollerCoaster Tycoon 2
- Panda trains for the Junior Roller Coaster.
- Panda World, a panda-themed scenario to go along with the panda theming.
- Ports of RCT1 scenarios: 
- Panda Themeing, consisting of a scenery group, giant panda statue, panda litter bin and bamboo shoots.
- Pink water.