Cross section can refer to:

• Cross section (geometry), the intersection of a 3-dimensional body with a plane
• Radar cross section, the unit of measure of how detectable an object is with a radar
• Cross section (physics), the likelihood of an interaction event between two particles
  • Neutron cross-section
  • Neutrino cross section
  • Absorption cross section
  • Photoionisation cross section
• Section (fiber bundle), in differential and algebraic geometry and topology, a section of a fiber bundle or sheaf
• Cross-sectional data, a type of one-dimensional data set in statistics and econometrics

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