Only Santa Knows is the sixth studio album and the first full-length Christmas album by Australian singer-songwriter Delta Goodrem. It was released on 13 November 2020 through Sony Music Australia. It is Goodrem's second Christmas release, after 2012's Christmas EP. The album includes two original tracks and 11 covers, including "Silent Night" with Gurrumul, which was recorded in 2014 and included on The Spirit of Christmas 2014.

Delta Lea Goodrem AM is an Australian singer, songwriter, television personality and actress. Goodrem signed a recording contract with Sony Music at the age of 15. Her debut studio album, Innocent Eyes (2003), topped the ARIA Albums Chart for 29 non-consecutive weeks. It is one of the highest-selling Australian albums and is the second-best-selling Australian album of all time with over four million copies sold.