Ethan and Grayson Dolan (born December 16, 1999), collectively known as the Dolan Twins, are an American comedy duo who rose to prominence in May 2013 on the video sharing application Vine.

The twins are from the Long Valley region of Washington Township, Morris County, New Jersey.

Since their beginnings, the duo has accumulated over 6.4 million followers on Vine and 11 million subscribers on YouTube, and embarked on a world tour titled the "4OU" Tour in 2016. The duo was also involved in a Twitter ad campaign for the social network's new stickers feature. At the 2016 Teen Choice Awards, the duo won the awards for Choice Web Star: Male and Choice YouTuber.

On March 27, 2018, the two announced a hiatus from YouTube through a video on their channel entitled Bye For Now. In the video, they stated that they wanted to re-evaluate themselves creatively and focus on their lives outside of the platform. They later announced their return on May 1, 2018.

In June 2018, the twins formed The Sister Squad with fellow YouTubers James Charles and Emma Chamberlain. The four uploaded simultaneous videos on their YouTube channels on June 19, August 28, October 31, and December 25, 2018, and were featured prominently in YouTube Rewind 2018. The Sister Squad was nominated for a 2019 YouTube Ensemble Shorty Award. The twins were nominated in several Streamy Award categories from 2016 to 2019, winning Creator of the Year at the 7th Streamy Awards.

Their father, Sean Dolan, died from cancer on January 19, 2019. He was fifty years old.

On October 8, 2019, they uploaded a sixty-minute video titled It's Time To Move On.... They explained the stress of their father's death, and that they intend to change the content of their channel and to a more flexible schedule.

On January 14, 2021, they uploaded a podcast titled We're Moving On From YouTube, onto their podcast channel Deeper with the Dolan Twins.