1123, commonly known as the Prostitution Reference, is a decision of the Supreme Court of Canada on the right to freedom of expression under section 2(b) of the Canadian Charter of Rights and Freedoms, and on prostitution in Canada.

Manitoba's Appeal Court had ruled the legislation violated the guarantee of freedom of expression in the Charter of Rights and Freedoms, by constraining communication in relation to legal activity (R. v. Skinner (1987), 35 C.C.C.

[1] The Supreme Court held that the criminal code provision that prohibited communication for the purpose of engaging in prostitution was in violation of the right to freedom of expression; however, it could be justified under section 1 of the Charter and so it was upheld.

[2] The majority, with both women dissenting, found that the purpose of eliminating prostitution was a valid goal and that the provision was rationally connected and proportional to that goal.

The justification was set out in three stages: The decision was later upheld in Canada (AG) v Bedford.