He was inducted into the Norwegian Academy of Science and Letters in 1991, and received an honorary degree from Lund University in 1999.
Stig Johansson was one of the founders of ICAME, the International Computer Archive of Modern and Medieval English, in 1977, and was the organization's first general secretary.
Stig Johansson was instrumental in compiling corpora and thereby developing the field of corpus linguistics.
The Oslo Multilingual Corpus (OMC[5]) was first conceived as an extension of the ENPC, and the work was directed by Stig Johansson.
He also directed the compilation of the Norwegian component of the International Corpus of Learner English (ICLE).