|Service type||Limited express|
|First service||15 July 1972|
|Current operator(s)||JR East|
|Distance travelled||128.9 km (80.1 mi)|
|Service frequency||4 return services daily|
|Line(s) used||Keiyo Line, Uchibo Line, Sobu Line|
|Catering facilities||Trolley service|
|Rolling stock||E257-500 series EMUs|
|Track gauge||1,067 mm (3 ft 6 in)|
|Electrification||1,500 V DC overhead|
|Operating speed||120 km/h (75 mph)|
The Sazanami (さざなみ) is a limited express train service in Japan operated by East Japan Railway Company (JR East). It runs between Tokyo and Tateyama via the Keiyo Line and Uchibō Line.
Seasonal Shinjuku Sazanami services operate at certain weekends between Shinjuku and Tateyama.
Principal stations served Tokyo - Soga - Goi - (Anegasaki) - Kisarazu - Kimitsu
The opening of the Tokyo Bay Aqua-Line road across the Tokyo Bay in 1997 saw increased competition from long-distance bus services offering cheaper fares, resulting in decreasing ridership figures on the Sazanami services. From the start of the 15 March 2014 timetable revision, the number of services was reduced to six return workings daily.