To fix a leaking kitchen sink faucet handle, turn off the water supply. Disassemble the handle to access the cartridge or valve. Replace any worn-out seals or O-rings. Reassemble the handle and turn the water supply back on to check for leaks.

Fix a leaking handle by turning off water, replacing seals or O-rings, and reassembling. Check for leaks after reassembly to ensure a proper fix.