Kenneth William George Farmer (25 July 1910 – 5 March 1982) was an Australian rules footballer who played for the North Adelaide Football Club in the South Australian National Football League (SANFL).

Dubbed the 'Bradman of football' in South Australia (contemporary East Fremantle footballer George Doig was given the same nickname in Western Australia), Farmer is the most prolific full-forward in elite Australian rules football. He is the only SANFL player to have scored 1,000 or more career goals in premiership matches, and also coached North Adelaide to two premierships.

Farmer was the eldest of two sons born to William Thomas Farmer, a labourer, and Ethel Ann (née Sitters). His younger brother, Elliott Maxwell, was born on 16 December 1911. Farmer was born and raised in North Adelaide and attended North Adelaide Public School, where he played Australian rules football on Fridays, and soccer on Saturdays. His early prowess in the round ball code resulted in being selected in the State Schoolboys soccer team.

Farmer left school at 14, as was common at the time, to work as a junior storeman with Swallow & Ariell Ltd. He did not play football again until 1927, when he played with North Adelaide Ramblers Seconds and the Marryatville amateur team. In 1928 he was invited to play with the North Adelaide juniors, where he demonstrated some talent at marking and goal kicking, winning the best and fairest award.

In 1929, the 18-year-old Farmer debuted in the North Adelaide League side. Playing at full-forward in his first season, he kicked an impressive 62 goals in only 14 games.

The following season was a special one marred by tragedy. Shortly after becoming the first SANFL player to kick 100 goals in a season, Farmer suffered the shock loss of his brother Elliott on 5 September when, on the way home, their motorcycle collided head-on with a truck on Frome Road. Both brothers were thrown from the vehicle, with Elliott suffering severe head injuries while Ken sustained a sprained ankle. Elliott was taken to Adelaide Hospital but died shortly after admission, while Ken was able to return home after treatment. The shock of losing his younger brother, with whom Farmer was very close, and who was well known at the football club due to taking Ken to and from football training, was enough for Farmer to announce that he would not play football again that season. News of the incident also reached Melbourne, where it was published in the Sporting Globe. In later years, Farmer was said to suffer long periods of depression, most likely as a result of this accident.

Farmer played in the winning 1930 Grand Final side despite the great personal distress of his brother's death weeks earlier. In the 1931 Grand Final, which North Adelaide would go on to win, Farmer kicked his 125th goal for the season, breaking Gordon Coventry's VFL and elite-football record of 124 goals.

Farmer captained North for five seasons (1934–1935, 1937–1938, and 1941) and was club's best and fairest player in 1936. Despite his imposing record, his best performance in the Magarey Medal count was only fourth.