Cross section may refer to:

• Cross section (geometry)
  • Cross-sectional views in architecture and engineering 3D
• Cross section (geology)
• Cross section (electronics)
• Radar cross section, measure of detectability
• Cross section (physics)
  • Absorption cross section
  • Nuclear cross section
  • Neutron cross section
  • Photoionisation cross section
  • Gamma ray cross section
• Cross Section (album), 1956 musical album by Billy Taylor

• Cross section (fiber), microscopic view of textile fibers.
• Section (fiber bundle), in differential and algebraic geometry and topology, a section of a fiber bundle or sheaf
• Cross-sectional data, in statistics, econometrics, and medical research, a data set drawn from a single point in time
  • Cross-sectional study, a scientific investigation utilizing cross-sectional data
    • Cross-sectional regression, a particular statistical technique for carrying out a cross-sectional study