Direct comparison
Criminology vs Criminal Justice: Key Differences
Criminology studies why crime happens; criminal justice studies how police, courts and corrections respond. Compare methods, data, funders, ethics, careers.
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How do Criminology, Criminal justice compare side by side?
The table below compares Criminology, Criminal justice across 12 procurement-relevant dimensions, from definition through careers, overlap and when to use which.
Side-by-side comparison
| Dimension | Criminology | Criminal justice |
|---|---|---|
| Definition | The scientific study of crime: why it occurs, how it is measured and distributed, how societies respond to it and what reduces it. It is an empirical, interdisciplinary social science, not a branch of law. | The systematic study of the institutions that respond to crime (police, courts and corrections) and of whether their policies, practices and programs work as intended. It is an applied, interdisciplinary field whose questions usually come from practice. |
| Core question | Why do some people, in some places and at some times, commit crime while others in similar circumstances do not? How much crime is there, and does a given policy actually reduce it? | How do agencies make decisions, and does this patrol strategy, pretrial policy, sentence or reentry program achieve its goal? What happens to people as they move from arrest through supervision and release? |
| Scope: causes of crime vs operation of the system | Centered on offending, victimization and social control: the causes, patterns and consequences of crime, including its distribution by neighborhood, age and social conditions. | Centered on the three connected components of the system: policing, courts and corrections, plus juvenile justice, victim services and the use of forensic evidence. Studies often follow people or cases across component boundaries. |
| Typical sub-areas | Criminological theory (strain, social learning, social control, routine activity, labeling, life-course), victimology, environmental and spatial criminology, biosocial and developmental criminology, cybercrime and white-collar crime. | Policing studies (tactics, use of force, procedural justice, technology), courts (charging, pretrial release, sentencing, problem-solving courts, indigent defense), and corrections (prisons, jails, probation, parole, reentry). |
| Dominant research methods | Theory testing with quantitative data: victimization and self-report surveys, official statistics, multilevel models, quasi-experiments, spatial analysis, plus qualitative work on offender decision-making and desistance. | Evaluation research (process, outcome or impact, and sometimes cost-benefit analysis), randomized and quasi-experimental field studies with agency partners, administrative-data analysis, surveys of staff and incarcerated people, and ethnography of how policies run in practice. |
| Data sources (general terms) | Crimes known to police (the FBI Uniform Crime Reporting Program and NIBRS), victimization surveys such as the National Crime Victimization Survey, which captures crime not reported to police, and self-report surveys. | The same federal series, plus Bureau of Justice Statistics collections on prisoners and jails, and agency administrative records on arrests, dockets, sentences and supervision, often linked across agencies. Many datasets are archived for secondary analysis, with restricted files needing a data use agreement. |
| Typical work | Developing and testing explanations of offending, analyzing crime trends, assessing measurement validity, reviewing the evidence on what works, and teaching theory and methods. | Evaluating programs and policies, analyzing agency and survey data, designing field experiments with police, court or corrections partners, writing proposals, and translating findings for practitioners and legislators. |
| Research ethics and human-subjects touchpoints | Studies of offenders, victims and people in custody involve vulnerable populations. Confidentiality matters when participants may disclose uncharged offenses (a Certificate of Confidentiality may be relevant). Subpart C applies only if participants are prisoners as the regulation defines them. | Often needs data-sharing agreements with agencies, and review of research that touches active legal proceedings. Subpart C of 45 CFR 46 adds IRB protections for prisoners, including the board composition rules, and limits research to defined categories. It turns on confinement status, not setting: released people and correctional-staff-only studies do not trigger it. |
| Training and credentials | Taught as its own department or jointly with sociology. Bachelor's degrees lead into analyst roles, master's degrees into research and policy roles, and a PhD is the usual route to faculty and senior research-scientist posts. No licensure is required to conduct research. | Taught at associate, bachelor's, master's and doctoral levels, often in criminal justice, criminology or sociology departments. The pattern mirrors criminology: a bachelor's or master's for many agency and analyst roles, a doctorate for faculty and independent research. Some practitioner roles carry agency-specific certification. |
| Primary funders | The National Science Foundation funds basic, theory-driven work, notably through its Law and Social Sciences program. The National Institute of Justice and the Office of Juvenile Justice and Delinquency Prevention fund applied and juvenile-focused work, and private funders such as Arnold Ventures support evidence-based policy research. | The Department of Justice research and statistics agencies (NIJ, BJS, OJJDP, within the Office of Justice Programs) are the main sources, with NSF for more basic work and private foundations. Grants often go to universities or to the agencies themselves, with the researcher as a subrecipient or partner. Priorities change, so confirm current solicitations. |
| Societies and journals | The American Society of Criminology (ASC), the larger society, tracing to a 1941 meeting; it publishes Criminology and Criminology & Public Policy and holds an annual meeting. | The Academy of Criminal Justice Sciences (ACJS), founded in 1963 as the International Association of Police Professors, with an applied and educational emphasis; it is behind Justice Quarterly and the Journal of Criminal Justice Education. Journals such as the Journal of Experimental Criminology are shared across both. |
| Careers, overlap and when to use which | Careers span academia, federal and state research agencies, nonprofit and think-tank research, evaluation consulting and analyst units inside agencies. Use "criminology" when the question is why crime happens, when theory or causes drive the study, or when the audience is a social science department. Neighbors are sociology and psychology. | Careers overlap almost entirely, plus agency roles and practitioner-facing positions. Use "criminal justice" when the question is how police, courts or corrections operate or whether an intervention works. Neighbors are public policy, political science and forensic science, which has its own laboratory-based community. When a study does both, name both. |
Common questions
Common questions about Criminology vs Criminal justice
What is the main difference between criminology and criminal justice?
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Criminology is the scientific study of crime itself: its causes, patterns and the theories that explain offending. Criminal justice is the study of the system that responds to crime (police, courts and corrections) and whether it works. The two overlap heavily and many departments teach both, but criminology asks why crime happens while criminal justice asks how the response operates.
Is criminology a science?
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Yes, as a social science. It builds falsifiable theories about crime and tests them against data using surveys, experiments, quasi-experiments and statistical modeling, drawing on sociology, psychology, economics and statistics. Criminal justice research uses the same empirical toolkit, with a stronger emphasis on evaluating policies and programs.
Which should I study if I want to work with data and research?
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Either can lead to research careers, and many programs combine them. Criminology programs lean toward theory and methods; criminal justice programs lean toward institutions and applied evaluation. Look at the department's methods courses, its faculty research areas and its internships with agencies. A bachelor's or master's degree is common for analyst roles, and a doctorate is generally expected for faculty posts.
Which funders support each field?
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Largely the same ones. The National Institute of Justice, the Bureau of Justice Statistics and the Office of Juvenile Justice and Delinquency Prevention sit within the Department of Justice's Office of Justice Programs. The National Science Foundation funds more theory-driven work, and private foundations such as Arnold Ventures support evidence-based policy research. Priorities change, so check each funder's current solicitations.
Does research with prisoners need extra review?
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In US federally supported research, yes. Subpart C of 45 CFR 46 adds IRB protections where participants are prisoners, including requirements on board composition and limits on the categories of research that may be approved. It depends on participants' confinement status, so studies of released people, or of correctional staff only, do not trigger it. This is a general summary, not legal advice; your IRB decides how it applies.
What are the main professional societies?
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The American Society of Criminology (ASC) is the larger and older society, and the Academy of Criminal Justice Sciences (ACJS) leans toward applied and educational work. Both hold annual meetings that serve as main venues for presenting new research, and many scholars belong to both.
How are forensic science and public policy related to these fields?
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Forensic science is a laboratory-based discipline that supplies evidence to the justice system and has its own research community, though it overlaps with criminal justice research on the use of forensic evidence. Public policy supplies much of the evaluation framework: both fields ask whether a policy achieves its intended effect, and both borrow methods from policy analysis and economics.
