Background: The most prevalent cardiac arrhythmia, atrial fibrillation (AF), is expected to affect around 16 million people worldwide by 2050. Because AF is linked to increased mortality, thromboembolic strokes, myocardial infarction, and heart failure, it costs the US health care system over $6 billion yearly. Aim of the Work: This study aimed to assess left atrial volume (LAV) in atrial fibrillation patients using non-invasive echocardiography and invasive 3D mapping (CARTO) and to assess its predictive value in recurrence of atrial fibrillation after ablation. Patient and methods: The study was conducted on 42 consecutive patients with non-valvular AF who underwent pulmonary vein isolation and came to follow up in the Outpatient Clinic of the