Yes, Dominik Mysterio has won a title.
Dominik is a one-time SmackDown Tag Team Champion with his father Rey Mysterio, in which they were the first real-life father-and-son team to win a tag team championship in WWE.
The American professional wrestler Dominik Óscar Gutiérrez is currently signed to WWE, where he performs on the Raw brand under the ring name Dominik Mysterio as a member of The Judgment Day.
After observing his father on several occasions, Dominik began training with Jay Lethal and his father to become a professional wrestler in 2018.
Dominik then appeared on an episode of SmackDown Live on March 19, 2019, with his father, Rey Mysterio, who announced that he would be facing Samoa Joe for the WWE United States Championship at WrestleMania 35 on April 7.
Amid the following months, he was involved in his father’s storylines and matches, including interfering in Rey’s WWE Championship match against Brock Lesnar at Survivor Series on November 24.
Dominik faced his father Rey Mysterio on WrestleMania 39 on Saturday, April 1, 2023. However, he lost the fight to Rey.