On February 13, 2019, the American Civil Liberties Union and the ACLU of New Hampshire filed a federal lawsuit challenging a New Hampshire law that unconstitutionally restricts the right to vote for students, young people, and those new to the state.

In December 2018, the ACLU filed a lawsuit challenging New Hampshire’s law against criminal defamation on behalf of a man arrested for insulting police online.

The ACLU sued New Hampshire for invalidating the absentee ballots of hundreds of voters, many of whom disabled, without warning.

The American Civil Liberties Union, the ACLU of New Hampshire and the Americans United for Separation of Church and State are challenging a statewide tuition tax-credit program in New Hampshire that would divert taxpayer funds to private religious schools in violation of the state constitution. The lawsuit was filed on behalf of eight plaintiffs, including clergy, public education advocates and parents of public school children.