aussieBum is an Australian men's swimwear and underwear manufacturer.

All aussieBum products are manufactured in Australia with the business run completely out of the company's headquarters in the Sydney suburb of Leichhardt.

The company has achieved international recognition for several products such as the Wonderjock, and Essence underwear; which contains vitamins locked in the fibre which releases through the skin.

In 2001, director Sean Ashby started aussieBum when he couldn’t find the style of nylon swimmers he grew up with. The company had an inauspicious launch in the middle of the dot-com bust, and at the time the original website ran from a suburban lounge room, created by Ashby. Joined by co-director Guyon Holland, they created a new market by bringing back the classic speedo-style Aussie cossie and introducing digital prints and other vibrant designs.

Since starting out with only A$20,000 in 2001, aussieBum is now a multi-million dollar global enterprise, employing over 35 people, manufacturing over 150 different styles of products. The company has doubled in size each year since its founding.