- index crime
- index of dissimilarity
- indexicality
- indicator
- indirect (causal) effect
- indirect difference, method of
- individualism
- induction
- industrial action
- industrial capitalism
- industrial conflict
- industrial democracy
- industrial integration
- industrial relations
- industrial reserve army
- The Industrial Revolution
- industrial sector
- industrial society
- industrial sociology
- industrialism
- industry, sociology of
- inequality
- infancy
- infant mortality rate
- inferential statistics
- inflation
- informal care
- informal economy
- informal social controls
- informal-sector theories
