Yes, there are deaf athletes who have participated in the Olympics and Paralympics. This includes Diksha Dagar and Becca Meyers.
Diksha Dagar: Olympics
Born with profound hearing loss, Diksha Dagar is a golf player who represented India in the 2020 Tokyo Olympics. She has also participated in the Deaflympics, where she won 2 medals.
Becca Meyers: Paralympics
Becca Meyers is a Paralympic swimmer representing the USA and a multiple world record holder. Due to Usher syndrome, she’s both deaf and blind. Yet, she has gone on to win numerous medals in the Paralympics and World Championships!