Preheat the oven to 400F. In a 9×13 baking dish, toss carrots with the olive oil and orange juice until well coated. Season with salt and pepper.
Roast in the oven for 25-30 minutes, or until they are tender and starting to caramelize. The olive oil and orange juice should thicken slightly and become syrupy in texture.
Remove the carrots from the oven and sprinkle with fresh dill, tossing gently to combine.