"Sitting on Top of the World" is a song by Australian pop singer and songwriter Delta Goodrem. It was sent to Australian contemporary hit radio on 5 April 2012. "Sitting on Top of the World" was released physically and digitally on 13 April 2012. "Sitting on Top of the World" marked the return to multi-platinum certified singles for Goodrem since 2003's "Predictable".

The release of "Sitting on Top of the World" was much anticipated. This was mostly due to the four years since Goodrem's last solo single, "I Can't Break It to My Heart" (2008). "Sitting on Top of the World" is about Goodrem "feeling like herself" again and feeling connected to the world through music/friendship.

"Sitting on Top of the World" was written by Goodrem and co-written and produced by John Shanks. Lyrically, it talks about stars aligning and being together as one. "So get up, stand up / What you waiting for?" she happily commands. "We gotta live life, give in to begin / We've got a love like no one knows!" she sings on the power pop track.

Brad Stern wrote for an MTV Buzzworthy article that the song is "a swoon-filled, carefree pop ditty." In another review, Stern wrote for MuuMuse that "probably the most fun, feel good, warm 'n' fuzzy on the inside bout of euphoria you'll feel since that last time you were tripping out on MDMA." He also praised her "sublime vocals", the "powerhouse instrumentation" and called it "an absolutely massive smash." In Australia, "Sitting on Top of the World" debuted and peaked at number two on the ARIA Charts, being held off the top spot by Carly Rae Jepsen's "Call Me Maybe". It was certified double platinum by the Australian Recording Industry Association (ARIA) for shipments of 140,000 copies. In New Zealand, the song debuted at number 38 and moved to number 23 in its second week.

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