The Scottish cyclist's sixth gold medal has made him the most successful Great British Olympian of all time, overtaking Sir Steve Redgrave.
A peak of 10.1m tuned in on BBC One and BBC Olympics 1 at around 6.30pm as Hoy drew closer to his victory at the Velodrome.
Interest in the Brownlee brothers attracted a high of 5.6m at 1pm, thought to be unprecedented figures in the UK for the sport of triathlon.
Despite there being no Team GB competitors, the men's 1500m final saw a peak of well over 11m at 9pm.
Olympics Breakfast (1.68m/41%) and Olympics Tonight (2.92m/25.3%) maintained big average audiences on BBC One.
BARB ratings data supplied by Attentional