Say You Will is the seventeenth studio album by British-American rock band Fleetwood Mac, released on 15 April 2003. It followed 1995's Time and was their first album since 1970 without vocalist/keyboardist Christine McVie as a full member following her departure in 1998, though she participated in some songs as a guest musician; it would be her last time being involved with the band in a studio capacity before her death in 2022. Lindsey Buckingham performed primary keyboard duties throughout the album.

This was the band's last full album with Buckingham before his dismissal from the group in 2018, although he later participated in their 2013 extended play.

Say You Will was the first studio Fleetwood Mac album to peak in the top three in the US since 1982's Mirage. The album debuted at No. 3 with sales of 218,000, spent two months within the top 40, and was certified Gold by the RIAA in July 2003 for 500,000 copies shipped in the US.

A limited edition version of the album was issued at the same time, featuring two live tracks ("Peacekeeper" and "Say You Will"), two additional studio tracks (Nicks' "Not Make Believe" and Buckingham's cover of Bob Dylan's "Love Minus Zero/No Limit"), an expanded booklet and poster.