Astronomy
Cassini–Huygens, mission to Saturn and Titan
Huygens (spacecraft), the probe of the Cassini-Huygens mission which landed on Saturn's moon Titan in 2005 2801 Huygens, an asteroid Huygens (crater), martian crater Mons Huygens, a mountain of Earth's Moon Huygens Gap, in the rings of Saturn
Physics
Huygens law; see one of: Huygens law (pendulums) Huygens law Huygens–Steiner theorem
Optics
Huygens–Fresnel principle
Huygens' principle, see Huygens–Fresnel principle
Huygens eyepiece, first compound eye piece
Huygens Software, a microscope image processing package
Mathematics and games
Huygens lemniscate, a figure eight curve
König–Huygens formula, see Steiner–Huygens
Other
Huygens-Fokker Foundation
Huygens' tritone, a musical interval
Huygens' engine
Christiaan Huygens College, High School in Eindhoven, Netherlands. Huygens College, High School in Heerhugowaard, Netherlands. The Christiaan Huygens, a ship of the Nederland Line. Huygens Scholarship Programme for international students and Dutch students W.I.S.V. Christiaan Huygens: Dutch study guild for the studies Mathematics and Computer Science at the Delft University of Technology Huygens Laboratory: Home of the Physics department at Leiden University Huygens Supercomputer: at SARA, Amsterdam The Huygens-building in Noordwijk, Netherlands The Huygens-building at the Radboud University, Nijmegen, The Netherlands.