Larsen opposed giving Obergefell full effect as a State Supreme Court Justice in Michigan:

In 2016, as a State Supreme Court Justice in Michigan, Joan Larsen joined a majority opinion failing to give the Obergefell decision full effect in the state of Michigan by refusing to reconsider a case denying parental visitation rights to a lesbian mother who would have been married to her ex-partner had same-sex marriage been legal at the time the couple was together.

Larsen wrote in opposition to the pro-equality decision Lawrence vs. Texas:

In a 2004 article, Joan Larsen wrote that the ruling in Lawrence vs. Texas was “remarkable” and that the majority’s reasoning “should alarm us.” The 2003 Lawrence vs. Texas decision was a landmark decision that decriminalized same sex relationships.

Larsen joined the majority in ruling in favor of allowing anti-LGBTQ preacher without a permit to disrupt a Pride event:

In 2018, Joan Larsen joined a majority opinion, ruling that an anti-LGBTQ preacher without a permit had the right disrupt a Pride event by spew hate speech through a bullhorn in Nashville, Tennessee. The city sought to enforce a neutral permitting requirement that applied to all speakers.