David Michael Jennens (8 April 1929 – 27 September 2000) was an English rower who competed for Great Britain in the 1952 Summer Olympics. He was a medical doctor. Jennens was born in Solihull, United Kingdom. He attended Oundle School and in 1947 went up to Clare College, Cambridge. He stroked the Clare coxless four that won the Cambridge University event twice, and in 1949 won the Visitors' Challenge Cup at Henley Royal Regatta.