Where is the fuse box for 2003 Acura TL?

There are 3: 1 in the driver's side door area (open driver's door, on the upper left side of you dash that faces the door, there is a V-shaped panel), 1 in the passenger door area (the reverse of the above), and under the hood (if you're standing in front of the car, facing the hood, it is back left). Page 307 of the manual will explain this along with fuse description.