Bandwidth has several related meanings:

• Bandwidth (signal processing) or analog bandwidth, frequency bandwidth or radio bandwidth, a measure of the width of a range of frequencies, measured in hertz
• Bandwidth (computing), the rate of data transfer, bit rate or throughput, measured in bits per second (bit/s)
• Spectral linewidth, the width of an atomic or molecular spectral line, measured in hertz

Bandwidth may also refer to:

• Bandwidth (company), an American communications provider
• Bandwidth (linear algebra), the width of the non-zero terms around the diagonal of a matrix
• In statistics kernel density estimation, the width of the convolution kernel used
• In language expectancy theory, a normative expected range of linguistic behavior
• In business jargon, the resources needed to complete a task or project
• Bandwidth (radio program), a Canadian radio program
• Graph bandwidth, in graph theory
• Coherence bandwidth, a frequency range over which a channel can be considered "flat"
• Power bandwidth of an amplifier, a frequency range for which power output exceeds a given fraction of full rated power