Klay Thompson has sunk the most threes in a game, with 14 three-pointers against the Bulls on October 29, 2018.

most 13 3pm games history
Interpreted as:
most 13 or more 3pm by a player regular-season games history
Klay ThompsonKlay Thompson10/29/2018GSWGSW@CHICHI14275240202182962.12458.322100.02+28
Zach LaVineZach LaVine11/23/2019CHICHI@CHACHA13354940204172860.71776.522100.05+15
Stephen CurryStephen Curry11/7/2016GSWGSWvsNOPNOP13364655204162661.51776.51250.02+7
StatMuse has game-level data for three-pointers going back to the 1979-80 season.