Yes, COVID-19 has been linked to hospital delirium. A 2020 study of 852 people admitted to a hospital for COVID-19 found that 11% developed delirium over the course of their stay.
A 2022 study of 927 older adults admitted to the hospital for COVID-19 found that about one-third developed delirium during their stay.
The above study was conducted in the early months of the pandemic, but more recent studies have shown that delirium is still common in older adults who are hospitalized for COVID-19.