Trolley wire may refer to:

• Overhead line, used to transmit electricity to trains, trams and trolleybuses
• Trolley Wire, magazine published by the Sydney Tramway Museum

• Cyclostrema supremum
• Cyclostremella
• Cyclostremella concordia
• Cyclostremella humilis
• Cyclostremella orbis
• Cyclostremellinae
• Cyclotaenia
• Cyclotaenia discus
• Cyclotetradecane
• Cyclothiazomycin
• Cyclotides
• Cyclotomic fast Fourier transform
• Cyclotosaurus pachygnathus
• Cyclotosaurus robustus
• Cyclotrachelus
• Cyclotrichium
• Cyclotridecane
• Cyclotron Accelerator
• Cyclotron (Blind Idiot God album)
• Cyclotron formula
• Cyclotron turnover
• Cyclotropia
• Cyclotruncated 5-cell honeycomb
• Cyclotruncated 5-simplex honeycomb
• Cyclotruncated 6-simplex honeycomb