Adam Peaty won his third gold and Fran Halsall her second as Britain made it their most successful European Championships ever.
Peaty, who set a world record 26.62 seconds in the semi-finals, won 50m breaststroke gold in a time of 27.00.
Halsall edged out fellow Briton Georgia Davies by one hundredth of a second to win the 50m backstroke final in 27.81.
Britain have won six golds and 19 swimming medals in total and are top of the medal table, with one day to go.
Their previous best performance at a Europeans Championships was the 18 medals, including six golds, they won in Budapest in 2010.
19 year-old Adam could still win a fourth gold in the 4x100m medley relay on Sunday.