Yes, you can. I honestly prefer soup a day after I make it because the flavors have had time to sit and be enhanced. So delicious! To reheat, put the soup in a pot on the stove over medium heat until it's nice and hot. You can also microwave it in 30 second intervals, making sure to stir it between each 30 second break. I recommend covering the soup with a microwave safe cover to avoid a tomato soup explosion!