Sherlock Hemlock (who calls himself "the world's greatest detective") is a Muppet character on the PBS series Sesame Street.

While Sherlock Hemlock made frequent appearances on the show in the 1970s and 1980s, in recent years, he has been phased out in favor of newer characters.

However, like Lefty the Salesman, Guy Smiley, and The Amazing Mumford, he is still a main character on Sesamstrasse, the German version of the show.

A well-known example of this is the "Chicken Salad Sandwich" skit, originally aired in 1970, which was Sherlock's first appearance.

The imagery of X-ray machines, a flashing railroad crossing, bottles of poison, and danger signs frightened many young viewers.