ARRMA is a brand of radio-controlled (RC) cars and trucks, manufactured by Horizon Hobby. The brand was originally established in 2008 and was focused on producing high-performance RC vehicles for bashing and off-road racing.

ARRMA quickly gained a reputation for producing durable and fast RC cars, and has since expanded its product line to include a wide range of vehicles, from monster trucks and buggies to short course trucks and rock crawlers. The company's vehicles are known for their innovative designs, high-quality materials, and powerful performance.

In recent years, ARRMA has introduced several groundbreaking technologies to the RC hobby industry, including their "Smart" electronics system, which allows users to monitor and adjust their vehicle's performance using a smartphone app, and their "Active Vehicle Control" system, which uses sensors and algorithms to improve stability and control while driving.