The actor had to learn Gaelic for his part as Colum McKenzie, the Laird and Chief of Clan McKenzie, in the popular TV series.
At the launch in his home town of Glasgow, he was joined by Gillebride MacMillan, the celebrated Gaelic singer who plays Gwllyn the Bard in Outlander, and the Gaelic coach for the series, Àdhamh Ó Broin.
LearnGaelic.scotis an interactive website that provides a first stop for anyone interested in learning Gaelic with a new emphasis on adult learners.
Lewis, who has starred on the big screen in films such as Billy Elliot and Gangs of New York as well as TV programmes including Silent Witness, said: “I have connections to North Uist where my wife’s father hails from so I have enjoyed the Gaelic language for many years and have a strong interest in learning it.
“My role in Outlander has allowed me to gain my own respect for the language and the enhanced LearnGaelic.scot website is a great online resource which should help encourage other learners of the language.”
Since it was first launched back in 2011, the LearnGaelic website has proven popular with Gaelic learners of all ages.