A consolidation bill is a bill introduced into the Parliament of the United Kingdom with the intention of consolidating several Acts of Parliament or Statutory Instruments into a single Act. Such bills simplify the statute book without significantly changing the state of the law, and are subject to an expedited Parliamentary procedure.

The parliamentary practice of legislating only for small portions of a subject at a time can create undue complexity in statute law. Acts relating to a particular subject often end up scattered over many years, and through the operation of clauses partially repealing or amending former acts, the specific meaning of the law regarding the subject becomes enveloped in intricate or contradictory expressions. For clarity, the law as expressed across many statutes is sometimes recast in a single statute, called a consolidation bill.

By 1911, such bills had been passed dealing with subjects as diverse as customs, stamps and stamp duties, public health, weights and measures, sheriffs, coroners, county courts, housing, municipal corporations, libraries, trustees, copyhold, diseases of animals, merchant shipping, and friendly societies.

These observations apply to the Public General Acts of the legislature. On the other hand, in settling private Acts, such as those relating to railway and canal enterprise, the legislature always inserted certain clauses founded on reasons of public policy applicable to the business in question. To avoid the necessity of constantly re-enacting the same principles in private Acts, their common clauses were embodied in separate statutes, and their provisions are ordered to be incorporated in any private Act of the description mentioned therein. Such are the Lands Clauses Acts, the Companies Clauses Acts and the Railways Clauses Acts.