Elvi Svendsen, later Carlsen (January 8, 1920 – February 7, 2013) was a Danish backstroke and freestyle swimmer who competed in the 1936 Summer Olympics and in the 1948 Summer Olympics.

In 1936, she was a member of the Danish relay team which finished seventh in the 4×100 metre freestyle relay event.

In the 100 metre freestyle competition she was eliminated in the first round.

Twelve years later she helped the Danish relay team to qualify for the final of the 4×100 metre freestyle relay event.

This biographical article related to a Danish swimmer is a stub.