Lymphocytic interstitial pneumonia (LIP) is on the spectrum of lymphoproliferative diseases that can affect the lungs. Although common in human immunodeficiency virus (HIV) infected children, it is rarely reported in adults. A 51-year-old HIV infected female patient presented with worsening dyspnea over five months. She had radiological findings of bilateral lung nodular infiltrates. Her CD4 count was 835 cells/uL and her HIV viral load was undetectable. Bronchoalveolar lavage did not yield any infectious pathogen. The pathology on an open lung biopsy revealed marked lymphocytic infiltrates and widening of alveolar septa consistent with the diagnosis of LIP. LIP is a rare entity in adults. Previously reported cases in HIV infected adults were associated with a high HIV viral load at the time of diagnosis. Here we present the first case of LIP in an HIV infected adult with an undetectable viral load.