Elin Katarina Elisabeth Johansson Welin (born 28 March 1963) is a Swedish prosecutor.
Katarina Johansson Welin graduated with a Degree of Master of Laws (LL.M.)
Following her service as a law clerk at Karlskrona District Court from 1988 to 1991, she was employed as a prosecutor intern at the Regional Public Prosecution Authority in Jönköping in 1991.
In 2012, she was promoted to director of public prosecution with coordinating responsibilities for Stockholm and Norrland, and in 2014, she became a senior prosecutor and area manager for the Stockholm Prosecution District.
On 29 February 2024 the Government appointed Johansson Welin, with immediate effect, as Prosecutor-General and head of the Swedish Prosecution Authority.