Yes, it is generally okay to leave grass clippings on the lawn as they can provide valuable nutrients back to the soil. Grass clippings contain nitrogen, phosphorus, and potassium, which are essential for healthy lawn growth. However, it's important to avoid leaving large clumps of grass clippings, as they can suffocate the grass underneath and create an uneven appearance. To prevent clumping, mow the lawn regularly and ensure the grass is dry before mowing.