The MIT-Physio AFib ECG Database is a comprehensive integrated resource that combines two of the most frequently used datasets for atrial fibrillation research: the MIT‑BIH AFib Database and the PhysioNet/Computing in Cardiology Challenge 2017 dataset. This resource includes 25 long-term 10‑hour recordings with dual-channel ECG signals (recorded at 250 Hz with 12‑bit resolution over ±10 mV) as well as short single‑lead ECG recordings (ranging from 30 to 60 seconds at 300 Hz).