Regression could refer to:
- Regression (psychology), a defensive reaction to some unaccepted impulses
- Past life regression, (psychology) a process claiming to retrieve memories of previous lives
- Software regression, (software engineering) the appearance of a bug which was absent in a previous revision
- Regression testing, a software testing which seeks to uncover regression bugs
- Regression toward the mean, a common statistical phenomenon
- Regression analysis, a curve fitting technique, most often utilizing least squares, used in statistics and econometrics, which can be broken into two categories: linear regression and nonlinear regression
- Infinite regression, a problem in epistemology
- Marine regression (geology), coastal advance due to falling sea level, the opposite of marine transgression
- Regression (medicine), a characteristic of diseases to express lighter symptoms without disappearing totally
- Age regression
- Reading regression, a counter-productive reading habit
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