The Malicious Communications Act 1988 (MCA) is a British Act of Parliament that makes it illegal in England and Wales to "send or deliver letters or other articles for the purpose of causing distress or anxiety".

The original purpose of the MCA was to prevent the sending of printed matter, but the scope of the act has been extended to cover electronic communications.

"[1] The MCA has been criticised for its aim as a means to censor free speech, a core civil liberty.

[2] The MCA was successfully used against Internet troll Sean Duffy who harassed the family of Natasha MacBryde after her death.

[citation needed] In the case of DPP v Connolly, the MCA was used to prosecute an anti-abortion campaigner who sent obscene images of foetuses to pharmacists who sold the contraceptive pill.