Line 9 or 9 Line may refer to:
Asia
China
- Line 9 (Beijing Subway), a subway line in Beijing
- Line 9 (Chengdu Metro), a metro line in Chengdu, Sichuan
- Line 9 (Chongqing Rail Transit), a metro line in Chongqing
- Line 9 (Guangzhou Metro), a metro line in Guangzhou, Guangdong
- Line 9 (Hangzhou Metro), a metro line in Hangzhou, Zhejiang
- Line 9 (Shanghai Metro), a metro line in Shanghai
- Line 9 (Shenyang Metro), a metro line in Shenyang, Liaoning
- Line 9 (Shenzhen Metro), a metro line in Shenzhen, Guangdong
- Line 9 (Tianjin Metro), a metro line in Tianjin
- Line 9 (Xi'an Metro), a metro line in Xi'an, Shaanxi
India
Malaysia
- Sungai Buloh-Kajang Line, called Line 9 at route map
Philippines
- Metro Manila Subway Line 9, Metro Manila
South Korea
- Seoul Subway Line 9, a subway line in Seoul
Europe
France
- Paris Métro Line 9, one of 16 metro lines in Paris
Italy
- Line 9 (Naples Metro), rapid transit railway line that forms part of the Metropolitana di Napoli
Russia
- Line 9 (Moscow Metro), a metro line of the Moscow Metro, Moscow
Spain
- Barcelona Metro line 9, one of the two branches of the Barcelona metro extension line 9/10
- Line 9 (Madrid Metro)
North America
Mexico
- Mexico City Metro Line 9, a rapid transit line in Mexico City
United States
South America
Brazil
- Line 9 (CPTM), São Paulo
Chile
- Santiago Metro Line 9, a planned railway line
Oceania
Australia
- T9 Northern Line, Sydney Trains service
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