A broadband polarizing beamsplitter is an optical device designed to separate light into different polarization states over a wide range of wavelengths.

It transmits one polarization (usually P-polarized light) and reflects the orthogonal polarization (usually S-polarized light) across a broad spectral range, rather than being optimized for a single wavelength.

These beamsplitters are commonly used in applications such as spectroscopy, multi-wavelength laser systems, and broadband imaging, where polarization control over a wide spectrum is required.