I have hot water in the bathroom sink and kitchen sink but no hot water in the shower what can I do?

Have you had work done on water system?

Do you have coming out of hot side of shower or is water cold.

If you have no water coming out then it is possible that you have sediment clogged the valve.

Shut off main water, remove valve and turn water on for a few seconds to clean out line. Clean valve and reinstall. Does this solve problem?

Chuck