- isoclinic line, isocline
- isoclinotropism
- isocolloid
- ISO Committee on Reference Materials
- isocompact
- isocon
- isoconcentrate
- isoconjugant
- isoconjugation
- isocorrelate
- isocosm
- isocoumarin
- ISO country code
- Isocrates
- isocratic elution
- isocryme
- isocubic
- isocurls
- isocurvature
- isocurvature CDM model
- isocurvature fluctuation
- isocurvature fluctuations
- isocurvature initial condition
- isocurvature model
- isocurvature perturbation