Morgan Cross' first-half goal won 10-player Celtic the Women's Scottish Cup final as profligate Rangers were made to rue a series of missed chances at Hampden.
Cross slid home Saoirse Noonan's wonderful cross on 26 minutes after Rangers winger Mia McAulay had hit the post at the other end.
Leanne Crichton's side - who missed an opportunity to win the SWPL title last weekend - dominated possession throughout the opening 45 minutes, but were unable to find a way past Celtic goalkeeper Adelaide Gay.
Play continued in much the same vein after the half-time interval, with Gay called into action on multiple occasions.
Grant Scott's side posed a threat on the counter-attack with substitute Jenny Smith forcing a fine save from Jenna Fife.
However, Celtic's task was made more difficult when Scotland defender Emma Lawton was shown a second yellow card on 58 minutes for halting Calliste Brookshire's forward progress.
Rangers piled forward in the closing stages and again hit the woodwork when Gay punched a corner onto her own crossbar.
They then felt they should have had a penalty when McAulay went to ground in second-half stoppage-time, but the officials were unmoved.
Celtic had lost to Rangers in all four league meetings this season and were also knocked out of the SWPL Cup by their Glasgow rivals, but stood firm to earn their first derby win over since August 2024.
Crichton's side end the season without silverware after their league heartbreak and losing March's SWPL Cup final to Glasgow City.