The Canadian musician called Hannah his wife in a post encouraging fans to vote in the US midterm elections.
Neil Young has confirmed his marriage to
Daryl Hannah after speculation they had wed earlier this year.
The musician referred to the Splash and Blade Runner actress as his wife in a blog alongside a video that he posted to encourage fans to vote in the US midterm elections.
Young, 72, released an official live video of the Crosby, Stills, Nash & Young song Ohio - a protest track written in 1970 in reaction to the Kent State shootings, in which four unarmed anti-war students were killed by members of the Ohio National Guard.
In his post, he called for stricter gun controls in the wake of 11 worshippers being shot at a synagogue in Pittsburgh on Saturday, in what is believed to have been the deadliest attack on Jewish people in recent US history.
"Today we see what we have become," he said. "With no real laws protecting us from guns, and with politicians supporting the NRA because the NRA supports them, we are not well represented.
"Today's students are brave, demanding change in violent times. We stand with them. They are us. We are them. This has been going on for far too long. My wife Daryl and I put this video together for you to reflect on."
The Canadian musician finished by urging fans to vote in the midterms on 6 November.
"Support the students. Support our children. They want protection. Not more guns. Give us common sense gun laws that protect our people, in schools, in places of worship, in the workplace and on the streets. VOTE."
Young and Hannah, 57, have reportedly been in a relationship since 2014. They are said to have tied the knot in California in August this year.