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Space Harrier 3D (スペースハリアー３Ｄ) is a rail shooter developed and published by Sega for the Sega Master System. It is a sequel to the Master System version of Space Harrier, making use of the 3-D Glasses to create the illusion of depth as the player flies into the screen. The 3D effect may be turned off with a code if the player doesn't have the required Glasses: get a high score, then enter your name as "THREE" with the second controller to enable the option.
Space Harrier 3D was included on the Sega Ages 2500 Vol. 20: Space Harrier Complete Collection for the PlayStation 2 in 2005. As the original 3-D Glasses aren't compatible with the PS2, other 3D modes are available such as red/green anaglyph.