Thomas Wessinghage (born 22 February 1952 in Hagen, North Rhine-Westphalia) is a German former middle- and long-distance runner who won the 1982 European Championships' final over 5000 metres beating the British world-record holder David Moorcroft.
Wessinghage missed a great chance of winning an Olympic medal that year because West Germany joined the United States-led boycott.
In the 1983 inaugural World Athletics Championships, he was among the favourites to win the 5,000-metre title, but for some reason he could not accelerate enough when it mattered the most - during the final lap - despite running at a steady rhythm earlier in the race.
Accordingly, he dropped from third to sixth during the last lap, and lost to the winner, Ireland's Eamonn Coghlan, by almost four seconds (see, for example, "World Athletics Championships 1983" / Yleisurheilun MM-kisat 1983, written by the "Runner" / Juoksija magazine's journalists and published in Finland in 1983).
In that race, he failed to advance to the final (see, for example, "The Great European Championships Book" / Suuri EM-kirja, published in Finland in 1990).