Iga Baumgart-Witan is a Polish sprinter specialising in the 400 metres. She won several medals at major championships as part of Polish 4 × 400 metres relays, including a gold in the mixed relay and a silver in the women's relay at the 2020 Tokyo Olympics.

The 4 × 400 metres relay or long relay is an athletics track event in which teams consist of four runners who each complete 400 metres or one lap. It is traditionally the final event of a track meet. At top class events, the first leg and the first bend of the second leg are run in lanes. Start lines are thus staggered over a greater distance than in an individual 400 metres race; the runners then typically move to the inside of the track. The slightly longer 4 × 440 yards relay, on an Imperial distance, was a formerly run British Commonwealth and American event, until metrication was completed in the 1970s.