Merry Christmas One and All! was the thirteenth concert tour by American singer Mariah Carey. Spanning 16 dates in the United States and in Canada, it began on November 15, 2023, in Highland, California, and concluded on December 17, 2023, in New York City. It followed Merry Christmas to All!, a December 2022 concert series that consisted of four arena shows and marked Carey's return to touring following the COVID-19 pandemic.