"When You Say Nothing at All" was released as the debut solo single by Irish singer-songwriter Ronan Keating. The song was recorded in 1999 for the soundtrack to the film Notting Hill and also appeared on Keating's debut solo album, Ronan. The song was released on July 26, 1999, in the United Kingdom. It peaked at number one in the UK, Ireland, and New Zealand. In the UK, the single was certified gold. In 2003, Keating re-recorded the song as a duet with Mexican singer Paulina Rubio, which was released in Mexico and Latin America (excluding Brazil) to promote Keating's second studio album, Destination. In Brazil, Ronan chose the Brazilian singer Deborah Blando to re-record the song for the 10 Years Of Hits album exclusive for that country (an exclusive music video was recorded for this version with Deborah).

When you say nothing at all soundtrack of which movies? Let's have some stream of consciousness first.
The relevant information to answer the above question is: The song was recorded in 1999 for the soundtrack to the film Notting Hill and also appeared on Keating's debut solo album, Ronan. So, the answer is Notting Hill.