Nonalcoholic fatty liver disease (NAFLD) describes a spectrum of fatty infiltration, inflammation, and fibrosis of the liver caused by metabolic factors. It is projected to become the leading cause of cirrhosis and need for liver transplantation in the United States. Guidelines from the American Association for the Study of Liver Diseases (AASLD) do not recommend routine screening of patients at high risk of NAFLD. European guidelines recommend testing for certain high-risk patients. Hepatic steatosis and nonalcoholic steatohepatitis (NASH) are difficult to diagnose and often go unrecognized until patients have advanced fibrosis or cirrhosis. Noninvasive methods are used to assess fibrosis, such as fibrosis scores and vibration-controlled transient elastography. Liver biopsy remains the reference standard for NASH diagnosis and fibrosis staging. The mainstays of treatment for NAFLD, NASH, and fibrosis are weight loss and a healthy diet. Currently, no drugs have been approved by the Food and Drug Administration (FDA) for management of these conditions. Drugs for diabetes management (eg, glucagon-like peptide 1 receptor agonists, pioglitazone) can be useful in patients with diabetes and NASH. Among patients with NAFLD, cardiovascular disease is a common cause of mortality. Thus, the AASLD guidelines recommend consideration of omega-3 fatty acids for hypertriglyceridemia management in patients with NAFLD, and statins for hyperlipidemia management in most patients with NAFLD and NASH.