Stephen Gallacher claimed a European Tour card in his first attempt in 1995 and has since won four European Tour titles, including two at the Omega Dubai Desert Classic. Secured his first win for five years when he triumphed at the Hero Indian Open in March 2019.

Won the Scottish Amateur Match Play, the Scottish Amateur Championship and the Lytham Trophy in a glittering amateur career which culminated in forming part of the victorious Great Britain and Ireland Walker Cup team at Royal Porthcawl in 1995.
A renowned supporter and mentor to aspiring young Scottish golfers, he plays a hands-on role in the Stephen Gallacher Foundation which aims to encourage Junior golfers in the Lothians and Borders areas of Scotland.

In the 2025 Senior Open, Stephen Gallacher delivered a strong performance, finishing tied for 17th with a four-round total of 278 (−2).