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Immigration Law

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Immigration law governs how non-citizens may enter, live, work, and become citizens in a country, and the conditions and consequences attached to their status. In the United States it is primarily federal law, and it affects individuals, families, employers, and communities.

This field covers a wide range of situations. It includes temporary visas for visitors, students, and workers; paths to permanent residence; family-based and employment-based processes; humanitarian protections for people fleeing harm; the requirements and process for becoming a citizen; and removal, the legal process by which a non-citizen may be ordered to leave. Immigration law also intersects with other areas — for example, criminal matters and family relationships can affect a person's immigration status.

For a non-lawyer, several concepts are important. Immigration status comes in many forms, each with its own rules, rights, and limits. Processes often involve detailed applications, supporting evidence, and strict deadlines, and decisions can have lasting consequences for a person and their family. The law in this area can change, and outcomes depend heavily on individual circumstances. People and employers commonly consult immigration lawyers when applying for a visa or residence, sponsoring a family member or employee, pursuing citizenship, seeking humanitarian protection, or facing removal proceedings, where the stakes are especially high.

Share of classified federal decisions

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share of classified federal decisions

Of the federal decisions we've classified by topic, the share each year that fall under this practice area — so a persistently high line means this is a large, enduring share of federal litigation. This is not a share of all litigation: only part of the corpus is topic-classified (unevenly across eras), and an opinion can belong to several areas, so areas need not sum to 100%. State cases are largely unclassified, so this is federal only. The dip in the last several years is a data-coverage gap — our corpus holds fewer opinions from the most recent years — not a real decline.

Circuit splits in immigration

Legal questions the federal courts of appeals are divided on — each links to the cases creating the split.

From the OpenJurist Bookshop

View all Immigration Law books →

Sub-practice areas

More specific practice areas within Immigration Law — narrower topics that fall under it, each with its own page.

Related practice areas

Civil Rights LawAsylum and Refugee LawCitizenship and Naturalization LawEmployment-Based Immigration LawFamily-Based Immigration LawRemoval and Deportation DefenseVisas and Green Cards Law

Primary law

The governing U.S. Code, statutes and founding documents for Immigration Law.

Key definitions

Defined terms that recur in immigration law — each links to its dictionary entry.

ImmigrationNaturalizationDeportationAsylumVisaRemovalRefugeeCitizenshipParoleExclusionAlienageDomicile

Landmark cases (3)

Landmark cases are the Supreme Court decisions that defined or reshaped Immigration Law — establishing the controlling principles courts still apply. Current law leads; where a decision overruled an earlier landmark, the superseded case is shown beneath it.

Key cases of the U.S. Courts of Appeals

The most-cited decisions applying U.S. Code Title 8 (Aliens and Nationality) — beyond the landmark cases above.

Frequently asked questions

Immigration Law by state

Courts, law libraries and state-specific resources. State law governs much of this area, so deadlines and rules vary by state.

Further reading

  • Investment Migration Programs 2023: The Definitive Comparison of the Leading Residence and Citizenship Programs - Paperback
    Investment Migration Programs 2023: The Definitive Comparison of the Leading Residence and Citizenship Programs - Paperback
  • The Ins on the Line: Making Immigration Law on the Us-Mexico Border, 1917-1954 - Paperback
    The Ins on the Line: Making Immigration Law on the Us-Mexico Border, 1917-1954 - Paperback
    S. Deborah Kang
  • Almost: A Novel of Ironic Possibilities, and Hope - Paperback
    Almost: A Novel of Ironic Possibilities, and Hope - Paperback
    Matthew Cooper
  • Cancellation of Removal for Lawful Permanent Resident - Paperback
    Cancellation of Removal for Lawful Permanent Resident - Paperback
    Brian D. Lerner
  • Whispers and Wailings - Hardcover
    Whispers and Wailings - Hardcover
    Khan Mosleh
  • Refugees' Roles in Resolving Displacement and Building Peace: Beyond Beneficiaries - Paperback
    Refugees' Roles in Resolving Displacement and Building Peace: Beyond Beneficiaries - Paperback
  • Bringing Law Home: Gender, Race, and Household Labor Rights - Hardcover
    Bringing Law Home: Gender, Race, and Household Labor Rights - Hardcover
    Katherine Eva Maich
  • A Practical Guide to Asylum Support and Judicial Review - Paperback
    A Practical Guide to Asylum Support and Judicial Review - Paperback
    Stephen Tawiah
  • The Deportation Regime: Sovereignty, Space, and the Freedom of Movement - Paperback
    The Deportation Regime: Sovereignty, Space, and the Freedom of Movement - Paperback
  • U.S. Immigration Policy, Ethnicity, and Religion in American History - Paperback
    U.S. Immigration Policy, Ethnicity, and Religion in American History - Paperback
    Michael C. Lemay
  • Huddled Masses, Muddled Laws: Why Contemporary Immigration Policy Fails to Reflect Public Opinion - Hardcover
    Huddled Masses, Muddled Laws: Why Contemporary Immigration Policy Fails to Reflect Public Opinion - Hardcover
    Kenneth K. Lee
  • Ask Sophie(TM): The Founder's Guide to Visas & Green Cards - Paperback
    Ask Sophie(TM): The Founder's Guide to Visas & Green Cards - Paperback
    Sophie Alcorn
  • Soldiers and Kings: Survival and Hope in the World of Human Smuggling - Paperback
    Soldiers and Kings: Survival and Hope in the World of Human Smuggling - Paperback
    Jason de Leã3n
  • Migration Law in the United States - Paperback
    Migration Law in the United States - Paperback
    Maria Isabel Medina
  • Green Card: Marriage-Based Interview Questions and Supporting Documents: Marriage-Based Green Card: Interview Questions and Supporting Documents - Paperback
    Green Card: Marriage-Based Interview Questions and Supporting Documents: Marriage-Based Green Card: Interview Questions and Supporting Documents - Paperback
    Vladimir Istomin Esq
  • Policing Immigrants: Local Law Enforcement on the Front Lines - Paperback
    Policing Immigrants: Local Law Enforcement on the Front Lines - Paperback
    Doris Marie Provine
  • An Analysis of the H-2A Agricultural Guest Worker Program and Recommendations for Future Policy - Paperback
    An Analysis of the H-2A Agricultural Guest Worker Program and Recommendations for Future Policy - Paperback
    Paulina M. Irigaray
  • Lawful Permanent Resident Parent Petitioning Child - Paperback
    Lawful Permanent Resident Parent Petitioning Child - Paperback
    Brian D. Lerner
  • Miguel Hernandez--Mystic: In Search of a Green Card - Paperback
    Miguel Hernandez--Mystic: In Search of a Green Card - Paperback
    Edgar Hernandez M. D.
  • Attorney Drafted U.S. Sample Business Plan - Hardcover
    Attorney Drafted U.S. Sample Business Plan - Hardcover
    Brian D. Lerner
  • Medellín V. Texas: International Justice, Federalism, and the Execution of José Medellin - Paperback
    Medellín V. Texas: International Justice, Federalism, and the Execution of José Medellin - Paperback
    Alan Mygatt-Tauber
  • Hamilton's Mexican Law [1882] - Hardcover
    Hamilton's Mexican Law [1882] - Hardcover
    Leonidas Hamilton
  • The Green Card Dowry Plan: A triumphant memoir of an Indian immigrant's plan to bypass dowries for his five sisters. - Paperback
    The Green Card Dowry Plan: A triumphant memoir of an Indian immigrant's plan to bypass dowries for his five sisters. - Paperback
    T. R. Coca
  • A Practical Guide to Long Residence Applications Under the Immigration Rules - Paperback
    A Practical Guide to Long Residence Applications Under the Immigration Rules - Paperback
    Rajiv Sharma

This overview is general legal information, not legal advice, and does not create an attorney–client relationship. Laws vary by state and change over time — consult a licensed attorney about your situation.