特发性肺纤维化(Idiopathic Pulmonary Fibrosis, IPF)又称隐源性纤维化肺泡炎，弥漫性纤维化肺泡炎，间质性弥漫性肺纤维化为特发性间质性肺炎中最常见之一种，是无明显原因的，进行性的肺纤维化。肺间质的广泛纤维化形成而肺组织增厚，造成不可逆转地丧失肺组织氧气交换的能力。 是一致命的呼吸系统疾病。最常发生在50至70岁的老年人。

Idiopathic pulmonary fibrosis (IPF) is a chronic and ultimately fatal disease characterized by a progressive decline in lung function. The term pulmonary fibrosis means scarring of lung tissue and is the cause of worsening dyspnea (shortness of breath). Fibrosis is usually associated with a poor prognosis.