Electrical engineering
- Übertragungstechnisches Symposium
- Ubiquitous positioning, indoor navigation, and location based service
- UCPSS
- UEES
- UGRA-Fachtagung Multimedia und Internet
- UIE International Congress on Electricity Applications
- UK conference. Audio Engineering Society (AES
- UK, Europe, China Millimeter Waves and THz Technology Workshop
- UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies
- UK-India-IDRC International Workshop on Cognitive Wireless Systems
- UK-India International Workshop on Cognitive Wireless Systems
- UK Performance Engineering Workshop
- UKRCON
- UkrMiCo
- UK Teletraffic Symposium
- ULIS
- Ulmer Elektrochemische Tage
- Ultimate Integration on Silicon Conference
- Ultra-High-Definition Imaging Systems
- Ultrasonics Symposium
- Ultra-Wideband Short-Pulse Electromagnetics Conference
- UMTS
- Underground Transmission and Distribution Conference
- Underwater Acoustics Group Conference
- Underwater Communications and Networking
- Underwater Communications and Networking Conference
- UniForum
- United States National Committee of URSI National Radio Science Meeting
- Universities Power Engineering Conference
- Universities Power Engineering Conference (UPEC
- Unmanned/Unattended Sensors and Sensor Networks
- Uprating and Refurbishing Hydro Powerplants
- URSI Atlantic Radio Science Conference
- URSI/IEEE Convention on Radio Science
- URSI International Ottawa Symposium on Electromagnetic Theory
- URSI International Symposium on Signals, Systems, and Electronics
- URSI International Symposium on Signals, Systems, and Electronics (ISSSE
- URSI-IPS Conference on the Ionosphere and Radio Wave Propagation
- URSI Radio Science Meeting
- URSI Regional Conference on Radio Science
- URSI Specialist Meeting on Microwave Scatter and Emission from the Earth
- URSI Symposium on Electromagnetic Wave Theory
- USA fall symposium. Digital Equipment Computer Users Society
- USENIX Workshop on Free and Open Communications on the Internet
- USERCOM
- User Conference on Advanced Automated Testing
- User Forum Thin-film Photovoltaics
- US-Japan Seminar on Dielectric and Piezoelectric Ceramics
- US National Committee of URSI National Radio Science Meeting
- USNC-URSI Radio Science Meeting
- UV
- UV and Higher Energy Photonics: from Materials to Applications