A G-line in Internet Relay Chat refers to a global network ban applied to a user.

G-line may also refer to:

• G (New York City Subway service)
• G Line (Los Angeles Metro), a bus rapid transit line in Los Angeles County, California
• G (Los Angeles Railway), former streetcar service
• G Line (RTD), commuter rail line serving Denver, Colorado
• Goubau line, a single-wire transmission line or waveguide
• The peak at 435.8 nm on the emission spectrum of mercury. See Mercury-vapor lamp § Emission line spectrum.
• Metro G Line (Minnesota), a planned bus rapid transit line in Minneapolis–Saint Paul, Minnesota
• G (SEPTA Metro), a trolley Line in Philadelphia.

This disambiguation page lists articles associated with the title G-line.
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