Line 9
- 9 (Los Angeles Railway)
- 9 (New York City Subway service)
- Barcelona Metro line 9
- Line 9 (Beijing Subway)
- Line 9 (CPTM)
- Line 9 (Chengdu Metro)
- Line 9 (Chongqing Rail Transit)
- Line 9 (Guangzhou Metro)
- Line 9 (Hangzhou Metro)
- Line 9 (Madrid Metro)
- Line 9 (Moscow Metro)
- Line 9 (Mumbai Metro)
- Line 9 (Naples Metro)
- Line 9 (Shanghai Metro)
- Line 9 (Shenyang Metro)
- Line 9 (Shenzhen Metro)
- Line 9 (Tianjin Metro)
- Line 9 (Xi'an Metro)
- Metro Manila Subway Line 9
- Mexico City Metro Line 9
- Moscow Metro
- Paris Métro Line 9
- Route 9 (Baltimore)
- Santiago Metro Line 9
- Seoul Subway Line 9
- Sungai Buloh-Kajang Line
- T9 Northern Line