Transmitter Hamburg-Billstedt, Radio transmitter in Bergedorf, Germany.

Transmitter Hamburg-Billstedt is a radio transmitter in Bergedorf featuring a main mast reaching 304 meters in height. The facility operates digital radio broadcasts and houses meteorological measurement equipment collecting temperature, humidity, and wind speed data.

The facility began operations in 1934 with two powerful 100-kilowatt medium wave transmitters. This marked the start of large-scale broadcasting in Hamburg.

The site's nickname "Hamburger Lichtwunder" comes from gardeners who found that a bulb wired to the ground and a taut wire lit up whenever the transmitter ran. Technicians traced the effect to induced power from the aerial, and Germany then banned using transmitter energy for anything but radio reception.

The facility stands in Billwerder, in Hamburg's Bergedorf borough, and is an operating broadcast site rather than a visitor attraction; there are no guided tours or open access hours. The masts are best viewed from the public paths and streets around the perimeter. Two smaller medium-wave masts were demolished by controlled demolition on 2 December 2016, and their foundations remain visible.

Since 1967 the University of Hamburg's Meteorological Institute operates instruments on the mast conducting continuous atmospheric measurements. The data is published online and contributes to weather research.