Diane Dolores Modahl MBE (née Edwards, born 17 June 1966) is an English former middle distance runner who specialised in the 800 metres.

[3] Her other notable results include finishing third at the 1989 IAAF Grand Prix Final, fourth at the 1993 World Championships, and winning the European Cup in 1994.

[4] Born Diane Dolores Edwards in Manchester, to Jamaican parents, she won the 1984 English Schools 800 metres title in 2:05.7.

She had one of the best seasons of her career in 1989, including running 2:00.83 to finish third in the 800m at the IAAF Grand Prix Final in Monaco, behind Ana Quirot and Christine Wachtel.

Modahl returned to competition in 1996 and finished second behind Kelly Holmes in the 800 metres at the British Olympic trials in June, running 1:59.87.

In 1998, she won her sixth AAAs 800m title, before going on to win the 800m bronze medal at the Commonwealth Games in Kuala Lumpur in the world class time of 1:58.81.

In 1994, following a routine drug test, Modahl was sent home from the Victoria Commonwealth Games in Canada by the British Athletics Federation and subsequently banned from competition, after the results were returned positive.

Modahl challenged the IAAF's drug-testing procedures and said she intended to produce evidence at the hearing which will show ''once and for all that no doping offence has been committed".

[9] On returning to the UK, and adamant of her innocence, Diane engaged lawyers to make the case that the laboratory in Lisbon which tested her sample had major flaws in their processing.

The case revealed that the laboratory had stored her urine sample on a table in the stadium in a room heated at 35 °C for three days, causing serious bacterial degradation.

[18] Diane also contributes to Street Games;[19] an initiative that harnesses the power of sport to create positive change in the lives of disadvantaged young people right across the UK, and ‘A Bed Every Night’; a scheme that supports the provision of shelter and support for people who are sleeping rough across Greater Manchester.

In the 2018 Birthday Honours, Diane was appointed a Member of the Order of the British Empire (MBE) for services to sport and young people in North West England.