Do all Canon lenses fit all Canon DSLR's?

[Xenedis]

EF-S lenses are made for Crop sensor cameras.

They're designed for Canon's DSLRs whose sensor is APS-C in size, but there are some notable exceptions:

1. EOS D30
2. EOS D60
3. EOS 10D

The 300D was the first camera to support EF-S lenses.

These are all quite old, so the OP is unlikely to encounter them.