The Sandringham line is a commuter railway line in the city of Melbourne, Victoria, Australia. Operated by Metro Trains Melbourne, it is the city's fourth shortest metropolitan railway line at 17.9 kilometres (11.1 mi). The line runs from Flinders Street station in central Melbourne to Sandringham station in the south-east, serving 14 stations via South Yarra, Balaclava, Elsternwick, and Brighton. The line operates from approximately 5am to 12am, daily, with 24 hour service available on Friday and Saturday nights. Services run every 7–8 minutes during peak hour, with services running every 15 minutes during the inter-peak period on weekdays, and every 20 minutes at night and during the day on weekends. Additionally, services run every 60 minutes overnight on Friday and Saturday nights as part of the Night Network.

Metro Trains Melbourne, often known simply as Metro, is the operator and brand name of train services on the electrified metropolitan rail network serving the city of Melbourne, Victoria, Australia. It is the largest urban rail network in Australia, with 17 lines and 221 stations across 405 km (252 mi) of railways, and the second busiest network in Australia, with a patronage of 99.5 million as of 2021–2022.