Definition
A private bill is a piece of proposed legislation that targets a specific individual, organization, or locality rather than the general public. When enacted, it becomes a private act — law that applies only to its named subject rather than to the population at large. This distinguishes it from a public bill, which proposes general law applicable to all persons or entities within a jurisdiction.
Private bills are introduced in both Congress and state legislatures, and historically in Parliament. Their subjects range from the highly personal — granting citizenship to a named alien, authorizing an individual to change their legal name, or waiving a legal claim against a specific person — to the institutional, such as granting a corporation a special charter, authorizing a local government to issue bonds, or conferring powers on a particular municipality.
The private bill should be distinguished from the private act, which is the same instrument after passage and enrollment. Until enacted, the instrument is a bill; afterward, it is an act or law.
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Common Language
Modern common usage (Wiktionary): A parliamentary bill promoted by an organization such as a local authority or company to obtain powers to do something; or an item of legislation for the benefit of a particular individual, not codified with generally applicable laws.
Historical common usage (Webster's 1913): Not separately defined; "bill" in the legislative sense appears as a draft of a proposed statute.
The common usage captures the concept tolerably well, but two gaps matter for legal research. First, the Wiktionary definition leans toward the British parliamentary model, where private bills are heavily associated with corporate and local authority promoters; in U.S. practice, the most prominent modern use is personal — relief for named individuals, particularly in immigration. Second, the phrase "not codified with generally applicable laws" reflects the result of passage (a private act is typically not codified alongside public statutes), but it is not itself the defining feature of the bill at the drafting stage.
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Common Confusion
PRIVATE BILL vs. PRIVATE MEMBER'S BILL: These are entirely different instruments. A private member's bill (in Commonwealth parliamentary systems) is a public bill introduced by a backbench legislator rather than by the government — it proposes general law. A private bill, by contrast, is defined by who it benefits (a specific party), not by who introduces it. Researchers working with British or Canadian sources must keep this distinction sharp; the terms are unrelated despite surface similarity.
PRIVATE BILL vs. SPECIAL LEGISLATION: The terms substantially overlap in American usage. "Special legislation" is the broader constitutional category — legislation singling out individuals or localities — and courts use it when evaluating constitutional equal-protection or special-laws challenges. "Private bill" is the procedural term used while the measure is before the legislature. The two concepts converge once the bill is enacted.
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Why It Matters in Research
The most significant contemporary context for private bills in U.S. federal practice is immigration relief. When an individual faces deportation and has exhausted administrative remedies, a private immigration bill introduced by a member of Congress can provide a last-resort path to relief. Congress rarely passes these bills to final enactment — most serve a procedural function: introduction of a bill often triggers a "stay of deportation" practice by the Department of Homeland Security while the bill is pending. Researchers working in immigration law need to understand this procedural use, which is distinct from actual legislative passage. The Law Mind Immigration Law Encyclopedia entry on private bills and deferred action is the essential companion resource.
For historical research, private bills were far more common in the nineteenth and early twentieth centuries. State legislatures regularly chartered corporations, granted divorces, changed names, and confirmed land titles through private acts. Constitutional reforms in many states during the latter half of the nineteenth century — prohibiting "special legislation" on enumerated subjects — were a direct reaction to the proliferation of private bills and the corruption associated with them. Corpus research in this era will encounter private acts embedded in session laws without systematic codification; they appear by subject only in the session law volumes, not in compiled statutes.
Jurisdictional variation in terminology is real: British parliamentary procedure treats private bills as a distinct procedural category with formal petition requirements and an adversarial hearing process before committees. American practice is far less formal — a member simply introduces a bill, and its private character is evident from its text. Researchers moving between U.S. and U.K. or Commonwealth sources should not assume procedural equivalence.
Historical session laws require care: private acts were often printed in separate volumes or in an appendix to the public acts, and finding aids may not index them reliably. State archives and historical societies are frequently the better resource for private acts predating the late nineteenth century.
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Historical Dictionary Support
The three historical sources converge on the core distinction — a private bill is one directed at particular persons or interests, while a public bill addresses the community generally — but they vary in depth and emphasis.
Black's formulation is functional and brief: private bills are defined purely by their particular object, as opposed to the general benefit characteristic of public bills. This captures the essential taxonomy but offers no procedural or constitutional texture.
Bouvier's is the most analytically precise of the three. Citing Abbott's Law Dictionary, Bouvier correctly confines the public/private distinction to the legislative context and notes that it does not extend to bills of exchange or bills in equity — a useful clarification given that "bill" carries distinct meanings across legal practice. Bouvier's description of a private bill as "the draught, as presented in the legislature, of a measure which, when passed, will affect individuals only" preserves the temporal point: the instrument is a bill only until passage, an act thereafter.
Rapalje & Lawrence offers no independent definition, cross-referencing only the general entry on "Bill." This is characteristic of the dictionary's approach to terms it treats as self-explanatory within broader categories, but it provides no additional navigational value here.
What the historical dictionaries collectively miss is the constitutional dimension that became legally significant after the mid-nineteenth century: the rise of anti-special-legislation clauses in state constitutions, which subjected private and special acts to heightened judicial scrutiny. A researcher relying solely on these definitions would have no signal that the very category they are researching was constitutionally contested.
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Jurisdictional Note
In U.S. federal practice, private bills are most visible in immigration and claims contexts. Many state constitutions contain "special legislation" or "local and special laws" prohibitions that limit or prohibit private bills on specific subjects — divorce, corporate charters, name changes, and the like — meaning that what was routine private legislation in 1850 may be constitutionally foreclosed today. In Westminster-system jurisdictions (U.K., Canada, Australia), private bills follow a formal petition-and-opposition procedure that has no counterpart in American legislative practice.
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Encyclopedia Cross-Reference
The Law Mind Immigration Law Encyclopedia: "Private Bills and Deferred Action — Last-Resort Immigration Relief"
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