Vadis is an Australian amplifier brand produced in Sydney by Soundcraft Pty. Ltd. during the 1960s and 1970s. The brand emerged during an era when high import duties made American and British amplifiers like Fender, Ampeg, Vox, and Marshall prohibitively expensive in Australia, creating demand for domestic builders who could supply working musicians with affordable tube-driven gear.

The Vadis catalog spanned a range of guitar and bass amplifiers, from small combos like the 10-watt Escort and the Model 401 (fitted with Plessey Rola speakers) up to larger heads and combos including the 250R, ET20, BR20, 408R, LB60, LB61, 601, and PA60. The LB60 is a twin-channel head from the late 1960s running a pair of EL34 power tubes, and while the LB series was marketed primarily for guitar, it was also used for bass. Some units were badged as Galaxie rather than Vadis, and the brand's circuits and cosmetics show design overlap with other Australian builders of the period such as Electravox.

Vadis amps have become collectible pieces of Australian vintage tube amp history, traded through shops like Twangcentral Guitars and on the used market. The brand is documented in Australian amp resources such as OzValveAmps and Jedistar, and turns up in community discussions on TalkBass and Australian vintage amp groups.

Vadis has 1 product cataloged on Equipboard, including Guitar Amplifier Stacks. Their gear is featured by 1 artist, with the strongest followings in Rock. Notable users include Ed Kuepper.