Denys Maasdorp (born 17 June 1963) is a former professional tennis player from South Africa.

Maasdorp, a right-handed player from Grahamstown, played on the professional tour in the 1980s.

Peaking at 180 in the world in singles, his best performance on the Grand Prix tour was a second round appearance at the 1987 Geneva Open.

[1] At the 1987 Wimbledon Championships he competed in the main draw of the mixed doubles, partnering Tina Mochizuki.

[citation needed] After leaving the tour he continued to play league tennis in Germany for many years.