Orvo Vitikainen (born 11 October 1940 in Taipalsaari)[1] is a Finnish lichenologist.
Between the years 1961 and 1981 he was a junior curator of cryptogams at the University of Helsinki Botanical Garden, and then from 1983 to 2004 he was the head of the lichen herbarium.
[2] Here he managed the internationally valuable collections of the early lichenologists Erik Acharius and William Nylander.
He has collected thousands of specimens for the herbarium from various locations in Finland, but also internationally, including Sweden, Norway, Denmark, Russian Karelia, Scotland, Austria, Italy, Hungary, Croatia, Montenegro, Tanzania, Kenya, British Columbia, and Brazil.
He contributed chapters on the families Peltigeraceae and Nephromataceae for the popular 2007 work Nordic Lichen Flora.