Peel the hard-boiled eggs and finely dice them.
Place the eggs in a medium mixing bowl.
Add mayonnaise, diced celery, fresh dill, and Dijon mustard.
Stir until well combined and creamy.
Season with salt and pepper to taste.
Wash the cucumbers and peel if desired.
Slice cucumbers into 1 to 1½-inch thick rounds.
Arrange cucumber slices on a serving platter.
Spoon approximately 1 tablespoon of egg salad onto each cucumber slice.
Garnish with fresh dill sprigs.
Serve immediately or chill until ready to serve.