The Xijiao Line of the Beijing Subway, also called No. 29 Line (simplified Chinese: 北京地铁西郊线; traditional Chinese: 北京地鐵西郊線; pinyin: běijīng dìtiě xījiāo xiàn) is a light rail line in Haidian District of Beijing. It runs west and north from Bagou on Line 10 to the Xiangshan - a total length of 8.8 km (5.47 mi). It opened on 30 December 2017. The line is operated by Beijing Public Transit Tramway Co. Ltd. a subsidiary of Beijing Public Transport Holdings, Ltd. which runs Beijing's Buses.

The Xijiao line uses the same fare system as other lines, but the transfer between the Xijiao line and Line 10 at Bagou station is not free, and customers transferring are required to pay a separate fare. Fares start at ¥3 and the maximum fare is ¥4.

All stations are located in Haidian District.

The line uses 31 low-floor 5-segment Hitachi Sirio trams built on license by CRRC Dalian. Single vehicles are normally used but can be coupled to form two-car trains when necessary.

On 1 January 2018, tram XJ003 derailed after a malfunction when departing from Fragrant Hills station at 2:36 PM with no passengers on board. The tram slid down the tracks with its control lever still at traction position after being lifted back on to the tracks later that day. Xiangshan station stopped service until 1 March 2018.

The involved set XJ003 was taken out of service since the incident and stored in the Bagou Depot.