- UCHINO Re:Luxe
- UCO
- Udea ef
- UDG
- UENO-mono
- UESUGI
- uFit
- UGREEN
- ulefone
- Ulike
- ULT POWER SOUND
- UMAX
- Umbra
- UMIDIGI
- Uncommon
- UNI-PEX
- UNiCASE
- UNiCASE BLUE LABEL
- uniform experiment
- UNION BINDING
- Uniq
- Unique Melody
- UNISEKA
- UNISON RESEARCH
- UNIT（NIXON）
- UNITCOM
- UNITE
- UNITED ARROWS
- UNITED ARROWS サウンズグッド
- Universal Filmarket
- UNIVERSAL OVERALL
- UNTITLED
- UONI
- UP START
- UQLiFE
- UQモバイル
- Urban Armor Gear
- Urban Armor Gear Metropolis(スマホ)
- Urban Armor Gear Monarch(スマホ)
- Urban Armor Gear Outback