Skip to main content
The new Teacher Workspace is here. Your first 3 assignments are free. Try it →

Tom Regan

Tom Regan is an ethics philosopher known for animal rights. He argues that many animals are subjects-of-a-life with inherent value, so they should not be treated as tools for human use.

Last updated July 2026

What is Tom Regan?

Tom Regan is a rights-based animal ethics philosopher, best known for arguing that many non-human animals have inherent value and moral rights. In Ethics, his name usually points to the view that animals are not just important because they can feel pain, but because they are individuals with their own lives, interests, and experiences.

Regan’s core idea is the phrase subjects-of-a-life. That means a being has beliefs, desires, memory, a sense of the future, emotional life, and a welfare that matters to it independently of what humans want from it. If an animal fits that description, Regan says it should be treated as having moral standing, not as a thing whose value depends on usefulness.

This is where Regan differs from utilitarian approaches. A utilitarian might defend an action if it produces more overall happiness or less suffering. Regan argues that this can still allow harmful practices if the benefits are large enough for humans. His view says some actions are wrong even when they produce good consequences, because they violate the animal’s rights.

That is why Regan criticizes practices like factory farming and animal experimentation. On his view, you do not get to justify severe harm to an animal simply because people gain food, convenience, or scientific data. The animal is not a resource to be traded off against human gain.

In an ethics class, Regan usually shows up when you compare rights-based ethics with welfare-based ethics. A welfare approach asks how to reduce suffering within systems that still use animals. Regan pushes a harder line: many uses of animals are wrong in the first place because they treat living beings as means instead of ends.

Why Tom Regan matters in ETHICS

Tom Regan matters because he gives you a clear rights-based argument in a topic where people often default to “humans need it” or “it reduces suffering.” His work forces you to ask a sharper question: even if an action benefits many people, does it still violate the moral status of the animal involved?

That makes Regan useful whenever you are comparing ethical theories. If a prompt asks whether animal testing, factory farming, or wildlife management is justified, Regan gives you a direct line of reasoning based on inherent rights rather than cost-benefit math. He is one of the clearest examples of how deontological thinking can be applied to non-human animals.

Regan also helps you separate two common ideas that get mixed together. One is animal welfare, which tries to make animal use less harmful. The other is animal rights, which says some uses are wrong even if they are “humane.” That distinction shows up a lot in class discussion, short response writing, and debate-style essays.

He is also a useful lens for reading modern controversies. Factory farming, for example, is not just a question of how animals are treated, but whether they should be used that way at all. Regan’s answer is a direct challenge to the assumption that human convenience automatically overrides non-human interests.

Keep studying ETHICS Unit 9

Official unit cheatsheet

open one-pager

How Tom Regan connects across the course

Animal Rights

Regan is one of the best-known defenders of animal rights. His view says animals with inherent value have claims that humans cannot override just because the outcome would be convenient or profitable. When you see a question about whether animals can be used as mere means, Regan’s rights-based approach is usually the framework to reach for.

Subjects-of-a-Life

This is Regan’s central idea about which animals deserve moral rights. A subject-of-a-life is more than a living body, it is an individual with experiences, preferences, and a life that can go better or worse for that being. In essays, this term is often the evidence behind Regan’s larger claim that animals deserve respect.

Utilitarianism

Regan argues against utilitarian thinking when it allows animal harm for bigger overall benefits. A utilitarian might support animal use if it creates more total happiness, but Regan says some harms are wrong regardless of the payoff. Comparing these two theories is a common way to analyze debates over farming and experimentation.

Animal Experimentation

Animal experimentation is one of the clearest real-world cases for Regan’s theory. He would reject experiments that treat animals as tools for human outcomes, even if the research could produce medical gains. That makes this topic a strong example of how rights-based ethics can conflict with scientific and social benefits.

Is Tom Regan on the ETHICS exam?

A quiz item or essay prompt may ask you to explain Regan’s view on animal rights, then apply it to something like factory farming or lab testing. The move is to identify whether the scenario treats animals as subjects with rights or as resources for human gain. If the action is justified mainly by usefulness, Regan would reject it. If you are comparing theories, use Regan to contrast rights-based ethics with utilitarian arguments that focus on overall outcomes.

Tom Regan vs Peter Singer

Tom Regan and Peter Singer are both major voices in animal ethics, but they argue differently. Singer is usually tied to utilitarianism and equal consideration of interests, while Regan argues from animal rights and inherent value. If a question asks whether the focus is reducing suffering or recognizing inviolable rights, that distinction is the clue.

Key things to remember about Tom Regan

  • Tom Regan argues that many animals have inherent value, so they should not be treated like objects or tools.

  • His phrase subjects-of-a-life means an animal has its own experiences, interests, and welfare that matter morally.

  • Regan’s approach is rights-based, so he can reject animal harm even when humans might benefit from it.

  • He is a direct challenge to factory farming and animal experimentation because both treat animals as means to human ends.

  • If you are comparing ethical theories, Regan usually stands on the side of animal rights rather than utilitarian tradeoffs.

Frequently asked questions about Tom Regan

What is Tom Regan in Ethics?

Tom Regan is a philosopher known for animal rights ethics. He argues that many animals are subjects-of-a-life with inherent value, which means they deserve moral respect and cannot be used simply because humans find it useful.

What does subjects-of-a-life mean in Regan’s theory?

Subjects-of-a-life are beings with beliefs, desires, memories, feelings, and a welfare that matters to them. In Regan’s view, that makes them individuals, not property, so they have moral rights that humans should not violate.

How is Tom Regan different from utilitarianism?

Utilitarianism judges actions by their consequences, especially overall happiness or suffering. Regan thinks that is not enough, because some actions against animals are wrong even if they produce good results for humans.

How do you use Tom Regan in an ethics essay?

Use Regan when you want a rights-based argument against animal use. He fits cases like factory farming, animal testing, or any scenario where the question is whether animals are being treated as means instead of beings with rights.

Tom Regan | Ethics | Fiveable