Greetings from sunny
If you are sure the bulb is good, then if you will unscrew the light fixture there should be 2 wires ... white and some color. If you will look in the fuse or breaker box (whichever you have), you should find the same color on one of the circuits. You either have that circuit open somewhere or that particular fuse or breaker is blown.
If both ends of the circuit are good (bulb, switch, fuse or breaker), then it gets a bit more difficult. Perhaps a splice came adrift somewhere in the walls.