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Factor, a Latin word meaning "who/which acts", may refer to:

Factor (agent), a person who acts for another, notably a mercantile and colonial agent
Factor (Scotland), a person or firm managing a Scottish estate
Factors of production, such a factor is a resource used in the production of goods and services

Coagulation factors, substances essential for blood coagulation
Environmental factor, any abiotic or biotic factor that affects life
Enzyme, proteins that catalyze chemical reactions
Factor B, and factor D, peptides involved in the alternate pathway of immune system complement activation
Transcription factor, a protein that binds to specific DNA sequences

Factor (programming language), a concatenative stack-oriented programming language
Factor (Unix), a utility for factoring an integer into its prime factors
Factor, a substring, a subsequence of consecutive symbols in a string
Authentication factor, a piece of information used to verify a person's identity for security purposes
Decomposition (computer science), also known as factoring, the organization of computer code
Enumerated type: a data type consisting of a set of named values, called factor in the R programming language

Factor, in the design of experiments, a phenomenon presumed to affect an experiment
Human factors, a profession that focuses on how people interact with products, tools, or procedures
Sun protection factor, a unit describing reduction in transmitted ultraviolet light

A term in multiplication
Divisor, an integer which evenly divides a number without leaving a remainder
Factorization, the decomposition of an object into a product of other objects
Integer factorization, the process of breaking down a composite number into smaller non-trivial divisors
A coefficient, a multiplicative factor in an expression, usually a number
The act of forming a factor group or quotient ring in abstract algebra
A von Neumann algebra, with a trivial center
Factor (graph theory), a spanning subgraph
Any finite contiguous subsequence of a word in group theory

An independent categorical variable.
- In experimental design, the factor is a category of treatments controlled by the experimenter.
In factor analysis, the factors are unobserved underlying hidden variables that explain variability in a set of correlated variables.

Factor (producer), Canadian hip hop artist
John Factor (1892–1984), British-American Prohibition-era gangster
Max Factor Sr. (1872–1938), Polish-American businessman and cosmetician
- Max Factor Jr. (1904–1996), son of the above, born Francis Factor

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 === Statistics ===
-* An [[independent variable]], either categorical or continuous, controlled by the experimenter.
+* An [[independent variable|independent]] [[categorical variable]].
+** In [[experimental design]], the factor is a category of treatments controlled by the experimenter.
-** "Factor" is sometimes used synonymously with [[categorical variable]], regardless whether it is controlled.
-* [[Factor analysis]],  the study of how ''factors'' or certain variables affect other variables
+* In [[factor analysis]],  the factors are unobserved underlying ''hidden'' variables that explain variability in a set of correlated variables.
-* The [[Sufficient statistic#Fisher–Neyman factorization theorem|factorization theorem]], a characterization of a class of statistics called sufficient statistics.
 == People ==