FiiO is a Chinese consumer audio company founded in 2007 and headquartered in Guangzhou. Operating as Guangzhou FiiO Electronics Technology Co., Ltd., the company designs portable and desktop audio equipment aimed at the personal hi-fi market, including digital audio players (DAPs), headphone amplifiers, digital-to-analog converters (DACs), Bluetooth DAC/amp receivers, and in-ear monitors.

The brand built its early reputation on affordable portable DAC/amps such as the E17 "Alpen," and later expanded into higher-end territory with the X-series DAPs (X3, X5, X7) and the Android-based M-series players (M11, M15, M17, M21, M23). Its Q-series portable DAC/amps (Q5, Q7) and K-series desktop units (K9, K15) are common entry points into desktop-class listening, while the BTR line of Bluetooth DAC/amps and the KA-series dongle DACs target on-the-go use with wired headphones. FiiO also produces IEMs under its FH, FA, and FD lines and a range of cables and accessories.

The company operates sub-brands Jade Audio, positioned at more budget-focused earphones, and Snowsky, a retro-styled audio line. Its products are widely discussed in personal audio communities such as Head-Fi and are sold through specialty hi-fi retailers and marketplaces rather than traditional musical-instrument channels.

FiiO has 19 products cataloged on Equipboard, including Headphones & In-Ear Monitors, Audio Interfaces, and Headphone Guitar Amplifiers. Their gear is featured by 2 artists, with the strongest followings in Electronic, Pop, and Orchestra. Notable users include BITZ and Jacob McDonnell.