Over 5,200 people across the country are waiting to be seen by the HSE's National Counselling Service.
169 patients in Galway, Mayo and Roscommon are on the list for over a year.
According to freedom of information figures, 700 people in Ireland have been waiting to see a psychologist for over six months.
Brendan Kelly, a professor of psychiatry in Trinity College, says it's very worrying.
"It is a very big concern, especially at the present time when levels of stress and anxiety are so high owing to Covid-19.
"The counselling services provided by the state are a vital part of mental health care in this country."
