Only Santa Knows is the first full-length Christmas album by Australian singer-songwriter Delta Goodrem. The album features cover versions of Christmas classics and 2 additional original songs. It also features guest performances by Gurrumul and Olivia NewtonJohn. The album performed very well in Australia, peaking at #2 on the Australian Albums Chart.

In 2021, a deluxe edition of the album was released, which featured 4 extra cover songs, including 'Christmas (Baby Please Come Home)', 'Sleigh Ride', 'Jingle Bell Rock' and 'Frosty The Snowman'. For the first time, this deluxe edition is available on vinyl.

Only Santa Knows (Deluxe Edition) is available as limited 2LP edition of 1500 individually numbered copies on snowy white marbled vinyl and includes an insert with liner notes and Christmas postcard.