Janne Halmkrona (born April 29, 1968) is a Finnish guitarist. He is best known for playing in CMX, a band he joined in 1990, replacing Pasi Isometsä. He has also released two albums with Sapattivuosi, a Black Sabbath tribute band.
Halmkrona holds a Master's degree in musicology. His playing has been influenced by bands such as the Sex Pistols, Judas Priest, Yes and Genesis. In addition to his guitar playing, he has also done radio work for Radio Helsinki, hosting a program called "Heviurpot", where he and Lasse Kurki played 1980s hard rock classics.
Halmkrona has co-produced two CMX albums, Veljeskunta (1991) and Aion (2003), as well as Sodankylä (2004) by Maj Karma. He has also worked as executive producer for pop singer/pianist Elviira.