Line 10 (Polígon Pratenc – Gorg) is the name of one of the two branches of the Barcelona metro line 9, currently (2020) under construction and to be operated by TMB. Like Line 9 and Line 11, it will be an automatic train operation (i.e. driverless vehicle) metro line.

The line will link the Zona Franca with Badalona, through Barcelona proper, sharing most of the area covered by L9. L9/10 will be the deepest and longest line in the network. Originally expected to be ready by 2008, ongoing problems with its construction are going to delay its completion until as late as 2025.

The line is currently operated in two sections, North and South, similarly to line 9.

The section from Gorg to Bon Pastor opened on 18 April 2010, and the section from La Sagrera to Bon Pastor (except Sagrera | TAV station) opened 26 June 2010. This section is operated as L10 Nord.

On 8 September 2018 the section between Foc station and the junction with the main route of line 9 at Can Tries Gornal opened to the public, with the exception of the stations Ciutat de la Justícia and Provençana. The opening of these two stations was deferred to 2019, with the rest of the line on the viaduct through the Zona Franca proper opening between 2020 and 2025. Trains on this section operate between Zona Franca and Collblanc stations, as the line from Collblanc to Zona Universitària is single track and does not have sufficient capacity for both L9 and L10 to run. This section is operated as L10 Sud.

Provençana station opened to the public on 2 March 2019 followed by Ciutat de la Justícia on 24 November 2019. The section between Foc and Zona Franca, with the exception of the Motors station, opened on 1 February 2020. On 7 November 2021, the section from Zona Franca to ZAL - Riu Vell opened to the public.

(Stations under construction in italics)

Zona Franca area

• Pratenc

Provisional L10 Sud Start

• ZAL Riu Vell
• Ecoparc
• Port Comercial│La Factoria
• Zona Franca
• Motors
• Foc (future connection with L2)
• Foneria
• Ciutat de la Justícia (L8)
• Provençana

Central branch, shared with L9

• Can Tries Gornal
• Torrassa (L1, RENFE)
• Collblanc (L5)

Provisional L10 Sud End

• Camp Nou (T1, T2, T3 via Avinguda de Xile)
• Zona Universitària (L3) (T1, T2, T3)
• Campus Nord
• Manuel Girona
• Prat de la Riba
• Sarrià (L6, L12)
• Mandri
• El Putxet (L7)
• Lesseps (L3)
• Muntanya
• Sanllehy
• Guinardó Hospital de Sant Pau (L4)
• Plaça de Maragall

Provisional L10 Nord Start

• La Sagrera (L1, L5, RENFE, future L4)
• Sagrera TAV (future connections with L4, RENFE-AVE)
• Onze de Setembre
• Bon Pastor

Besòs area

• Llefià
• La Salut
• Gorg (L2, T5, T6)

Provisional L10 Nord End

• Avui article, part 1
• Avui article, part 2

41°26′27″N 2°14′02″E / 41.44083°N 2.23389°E / 41.44083; 2.23389