Jonkheer Christiaan van Lennep (Dutch pronunciation: ['kr?sti?ja?n v?n 'l?n?p]; 3 January 1887 – 5 December 1955) was a Dutch tennis player and multiple champion of The Netherlands.
He won the singles title at the Dutch National Tennis Championships in 1905, 1907, 1919, 1921, 1925 and 1926.
He was also a seven times doubles champion.Van Lennep participated in the singles and doubles events at the 1908 and 1924 Olympics.
His best result was reaching the third round in the singles event at the 1924 Olympics in Paris.
In the third round he lost to American Watson Washburn by three sets to one.