"Mainstream Science on Intelligence" was a public statement issued by a group of researchers led by psychologist Linda Gottfredson. It was published originally in The Wall Street Journal on December 13, 1994, as a response to criticism of the book The Bell Curve by Richard Herrnstein and Charles Murray, which appeared earlier the same year. The statement defended Herrnstein and Murray's controversial claims about race and intelligence, including the claim that average intelligence quotient (IQ) differences between racial and ethnic groups may be at least partly genetic in origin. This view is now considered discredited by mainstream science.

The statement was drafted by Gottfredsen, a professor of educational psychology at the University of Delaware. It was sent to 131 researchers whom Gottfredsen described as "experts in intelligence and allied fields". Of these, 52 signed the statement, 48 returned the request with an explicit refusal to sign, and 31 ignored the request.

According to a 1996 response by former American Psychological Association president Donald Campbell, only ten of those who signed were actual experts in intelligence measurement. The Southern Poverty Law Center reported that 20 of the signers were recipients of funding from the white supremacist organization the Pioneer Fund, including Gottfredson herself.

During subsequent years, both the substance and the interpretation of this letter have received criticism from scientists.

Gottfredson was prompted to write the statement by what she considered to be "outdated, pseudoscientific notions of intelligence" promoted by critics of The Bell Curve in the controversy that resulted from the publication of the book. She contacted David Brooks of The Wall Street Journal, who was willing to publish a short statement signed by experts describing what he considered mainstream in the study of intelligence. Gottfredson drafted the statement, had it vetted by several researchers, and finally solicited signatures for it from experts in several disciplines, including anthropology, behavior genetics, mental retardation, neuropsychology, sociology, and various specialties in psychology. The experts invited to sign the statement were not given an opportunity to revise it, nor was anyone told who else had been invited or who had already given his or her signature.

The invitation to sign was sent to 131 researchers, of whom 100 responded by the deadline. The signature form asked whether the respondent would sign the statement, and if not, why not. 48 sent back the request with an explicit refusal to sign and 31 ignored the request. According to Gottfredson, seven of those who explicitly refused to sign did so "because they thought the statement did not represent the mainstream, 11 because they did not know whether it did, and 30 for other reasons". 52 respondents agreed to sign the statement.

The letter to The Wall Street Journal set out 25 numbered statements it termed "conclusions regarded as mainstream among researchers on intelligence" and "fully described in the major textbooks, professional journals, and encyclopedias in intelligence":

A 1995 article by Joseph L. Graves & Amanda Johnson was critical of the scientific basis on which Mainstream Science on Intelligence rested. The article stated that the statements in Mainstream Science on Intelligence