David John Simms (13 January 1933 – 24 June 2018) was an Indian-born Irish mathematician who was a Fellow Emeritus and former Associate Professor of Mathematics at Trinity College, Dublin.

Born in Sankeshwar, Mysore (the state now known as Karnataka), India, he specialized in differential geometry and geometric quantisation.

[1] Simms completed his undergraduate degree in Mathematics in Trinity College Dublin, graduating in 1955.

[5] Simms was married to Anngret Erichson, a former associate professor and head of geography at University College Dublin.

As a child Simms survived 13 days at sea following the sinking of the SS City of Cairo in November 1942.