| Prado Museum (free last two hours) | Every day · Monday to Saturday 18:00–20:00, Sundays and public holidays 17:00–19:00. Closed 1 January, 1 May and 25 December. Short hours (10:00–14:00) on 6 January, 24 and 31 December, with no free slot. | Everyone | Free tickets are collected at the ticket desks for the free slot, and the line forms along the Goya entrance well before it starts. Check the museum's own site for any online option. |
| Reina Sofía Museum (free evenings) | Monday and Wednesday to Saturday 19:00–21:00 · Sunday 12:30–14:30. Closed Tuesdays. Also free all day on 18 April, 18 May, 12 October and 6 December. | Everyone, individual visitors only (no groups in the free slot) | You still need a ticket in the free hours. Book the free ticket on the museum's site, or pick one up at the ticket office. |
| Thyssen-Bornemisza Museum (free Mondays) | Mondays 12:00–16:00, permanent collection · Saturdays 21:00–23:00, temporary exhibitions on the ground and lower floors only. Closed 1 January, 1 May and 25 December. | Everyone, until the building reaches capacity | No ticket on Mondays, the ticket office is closed and you walk in. Saturday night entry is at the door from 21:00. |
| Royal Collections Gallery (free for EU and Latin American citizens) | Monday to Thursday 18:00–20:00. The gallery clears 15 minutes before closing. Closed 1 and 6 January, 1 May and 25 December. | Citizens of the European Union, people with residence or a work permit in the EU, and citizens of Latin American countries, with ID. Also free for everyone on 18 May and 12 October. | Free tickets only at the gallery's ticket office on the day. |
| National Archaeological Museum (weekend free hours) | Saturdays from 14:00 to closing at 20:00 · Sundays 9:30–15:00. Also free on 18 April, 18 May, 12 October and 6 December. Closed Mondays. | Everyone. Under-18s and over-65s are free at any time. | Not needed. Pick up a free ticket at the desk. |
| Royal Academy of Fine Arts of San Fernando (free midday slot) | Tuesday to Friday (not public holidays) 13:30–15:00, permanent collection only. Also free on 18 May, 12 October and 6 December. Closed Mondays and all of August. | Everyone. Under-18s, university students aged 18–25 and unemployed visitors are free during all opening hours with proof. | Not needed, and groups are not admitted in the free slot. |
| Cerralbo Museum (Thursday evening and Sundays) | Thursdays 17:00–20:00 (not public holidays) · Sundays 10:00–15:00. Also free on 18 April, 18 May, 12 October and 6 December. Last entry one hour before closing. Closed Mondays. | Everyone | Not needed. Bags and umbrellas go in the lockers at the ticket desk. |
| Museum of the History of Madrid | Always · Tuesday to Sunday 10:00–20:00. From 15 June to 15 September 10:00–19:00. Closed Mondays, 1 and 6 January, 1 May, 24, 25 and 31 December. | Everyone | Not needed |
| San Isidro Museum, the Origins of Madrid | Always · Tuesday to Sunday and holidays 10:00–20:00. From 15 July to 15 September 10:00–19:00. Closed Mondays, 1 January, 1 May, 24, 25 and 31 December. | Everyone | Not needed. The free guided tour on Wednesdays at 12:00 needs advance sign-up. |
| Andén 0, Chamberí ghost station | Fridays 16:00–20:00 · Saturdays 10:00–14:00 and 16:00–20:00 · Sundays 10:00–14:00. Closed 25 December, 1 and 6 January. | Everyone | Booking is required on the Metro museums site. Each month's slots open between the 19th and 22nd of the month before and go fast. Guided visit in Spanish, groups of 28. |
| Geomineral Museum | Always · every day including Mondays and holidays 9:00–14:00. Closed 24, 25 and 31 December, 1 and 6 January. | Everyone. Carry photo ID, it is a government building and you may be asked for it. | Not needed |