RadioShack is an American consumer electronics brand founded in 1921 that became one of the largest tech retail chains in the world after being acquired by Tandy Corporation in 1962. While best known to the general public as a parts store and gadget shop, RadioShack played a quiet but persistent role in music gear through its private-label house brands — most notably Realistic, introduced in 1954 with input from Harman Kardon, along with Optimus, Archer, and Micronta. These lines covered budget hi-fi receivers, speakers, microphones, mixers, headphones, reverb units, and patch cables that found their way into countless home studios and rehearsal spaces.

The Realistic catalog produced several pieces with cult status among recording engineers and musicians. The Realistic 33-1070 Highball dynamic microphone and the PZM (Pressure Zone Microphone) boundary mics, co-developed with Crown, are frequently cited as inexpensive workhorses — Beck's "Loser" and White Town's "Your Woman" are both widely reported to have been tracked with RadioShack PZMs. Realistic spring reverb units and small mixers have also been adopted by guitarists and lo-fi producers as character effects rather than utility gear.

The brand was relaunched as a product label under Unicomer Group, distributing audio accessories, headphones, Bluetooth speakers, cables, and small electronics through radioshack.com and partners like Amazon and Walmart. The Realistic name was briefly revived in 2016 for a line of Bluetooth devices.

RadioShack has 19 products cataloged on Equipboard, including Dynamic Microphones, DJ Mixers, and Mixers. Their gear is featured by 10 artists, with the strongest followings in Rock, Electronic, and Pop. Notable users include James Murphy, Joe Hawley, and Maynard James Keenan.