The women's 800 metres at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 26, 27 and 29 August.

[1] Eunice Jepkoech Sum of Kenya entered the competition as the defending champion and also as the world-leading athlete for the season with her time of 1:56.99 minutes.

[2][3] The third semi-final was the fastest, with Melissa Bishop battling Maryna Arzamasava to the line, leaving defending champion and world #1 Eunice Jepkoech Sum as a time qualifier.

Bishop's winning 1:57.52 became the new Canadian National Record.

It was three abreast down the home stretch but Arzamasava never relinquished the lead, Bishop unable to get ahead on the inside and Sum just slightly behind them both.