Boreczek may refer to the following places in Poland:

• Boreczek, Lower Silesian Voivodeship (south-west Poland)
• Boreczek, Subcarpathian Voivodeship (south-east Poland)
• Boreczek, Masovian Voivodeship (east-central Poland)
• Boreczek, Greater Poland Voivodeship (west-central Poland)
• Boreczek, Warmian-Masurian Voivodeship (north Poland)

• Electron shell configuration
• Electron shells
• Electron, South Africa
• Electron spectrometer
• Electron spin resonance
• Electron spin resonance spectroscopy
• Electron Spiral Toroid
• Electron spiral toroid
• Electron subshell
• Electron Synchrotron
• Electron theory
• Electron transfer
• Electron transport
• Electron transport chain
• Electron transport system
• Electron tree
• Electron Tube
• Electron tube
• Electron tubes
• Electron tunneling
• Electron tunnel microscopy
• Electronuclear force
• Electronvolt
• Electron Volt
• Electron-volt