Salon Kitty was a high-class Berlin brothel used by the Nazi intelligence service, the Sicherheitsdienst (SD), for espionage purposes during World War II.

Created in the early 1930s by Katharina "Kitty" Schmidt, the salon was taken over by Nazi secret service and senior SS officer Reinhard Heydrich and operated by his subordinate Walter Schellenberg in 1939. The brothel was overtly managed by original owner Kitty Schmidt throughout its existence. The plan was to seduce top German dignitaries and foreign visitors, as well as diplomats, with alcohol and women so they would disclose secrets or express their honest opinions on Nazi-related topics and individuals. Guests included Heydrich himself, SS General Joseph Dietrich, Italian Foreign Minister Galeazzo Ciano, and Nazi Propaganda Minister Joseph Goebbels. The salon had to relocate after an air raid in 1942, but eventually, as the war progressed, the project lost its importance due to the decreased number of clientele.

Salon Kitty has been the inspiration or subject of brothels featured in films involving Nazi espionage.

In the 1930s, "Salon Kitty" was a high-class brothel at 11 Giesebrechtstrasse in Charlottenburg, a wealthy district of Berlin. Its usual clientele included German dignitaries, foreign diplomats, top industrialists, high-ranking civil servants and senior Nazi Party members. Its madame was Katharina Zammit, better known as Kitty Schmidt, who ran the brothel from its inception.

Schmidt had smuggled most of her fortune to British banks. When she eventually tried to leave the country on 28 June 1939, Sicherheitsdienst (SD) agents arrested her at the Dutch border and took her to Gestapo headquarters. Once there she was seen by Walter Schellenberg, who at that time worked in the counter-intelligence department of the SD. He gave her an ultimatum: cooperate with the Nazis or be sent to a concentration camp.

Using Salon Kitty for espionage purposes was an idea of Reinhard Heydrich, a leading SS general and police chief within Nazi Germany. The idea was to entertain prominent guests with wine and women, so they would disclose secrets or talk about their real opinions to ensure their support could be relied upon. The nine rooms of the salon were lavishly expanded and renovated to the highest standards of the 1930s. Schellenberg installed covert listening devices in the rooms and converted the basement into a "workshop" where every conversation was recorded on wax discs.

For the purpose of espionage, the SS started looking for young women to work in the brothel. In a circular deemed "top secret", Schellenberg asked administrative offices in Berlin for assistance. The requirement profile read: "Wanted are women and girls, who are intelligent, multilingual, nationalistically minded and furthermore man-crazy" (Gesucht werden Frauen und Mädchen, die intelligent, mehrsprachig, nationalistisch gesinnt und ferner mannstoll sind.). Berlin's Sittenpolizei ("vice squad") arrested dozens of Berlin prostitutes and selected the most "emotionally reliable" as potential agents to work at Salon Kitty. They were taught foreign languages, codes, and military insignias, and they were instructed on current affairs and methods to gather information without raising suspicion.

In March 1940, the brothel re-opened, except now she had a special book of twenty additional women she should only show to certain clients, specifically only those customers who used the secret phrase "I come from Rothenburg".