Sender Ravensburg, Communication tower in Illmensee, Germany.

Sender Ravensburg is a broadcast tower in Illmensee, in the southern part of Baden-Württemberg, Germany. The site consists of several antenna masts of different heights that together cover the radio and television reception area.

The second mast at the site, a free-standing steel lattice tower, was erected in 1961 as an antenna carrier for ZDF. The 172-metre guyed steel tube mast served as the main transmitter for ZDF and SWR Fernsehen Baden-Württemberg until 27 November 2007, when DVB-T took over; DVB-T2 followed on 24 October 2018 and DAB+ on 18 November 2015. Since the 244-metre Bodenseesender mast near Meßkirch was demolished in 2013, the Ravensburg mast has been the tallest structure in Sigmaringen district.

The tower carries regional television programs such as ZDF and SWR Fernsehen Baden-Württemberg, which many households in the area receive daily. It links this rural part of southern Germany to the national broadcasting network.

The site is an active transmission facility and visitors cannot enter, but the masts are clearly visible from the surrounding countryside. Footpaths and roads nearby offer good angles for viewing the structure from the outside.

The 172-metre guyed steel-tube mast is the tallest structure in Sigmaringen district, a status it gained in 2013 when the 244-metre Bodenseesender mast near Meßkirch was demolished after shutdown. A second, free-standing steel lattice antenna carrier stands further east-northeast; built in 1961 for ZDF, it now serves various radio services.