Ilona Longo (née Schoknecht, divorced Briesenick and Slupianek; born 24 September 1956) is a German former shot putter who represented East Germany.

In 1977, she was disqualified after she tested positive for anabolic steroids at the European Cup meeting in Helsinki, where she dominated her event with a superlative 21.20.

[1] The International Amateur Athletics Federation suspended Slupianek for 12 months, a penalty that ended two days before the 1978 European championships in Prague.

In the reverse of what the IAAF hoped, sending her home to East Germany meant she was free to train unchecked with anabolic steroids, if she wanted to, and then compete for another gold medal.

Competing as Ilona Briesenick, she won her final major medal when winning silver at the 1987 World Indoor Championships.