Hjalmar Johannessen (24 May 1907 – 19 August 1959) was a Norwegian athlete who specialized in the 400 and 800 metres.
At the 1932 Summer Olympics he reached the heats in the 800 metres, where he failed to progress with a time of 1:54.3 minutes, and also the quarterfinal in the 400 metres, where he achieved 49.4 seconds. At the 1936 Summer Olympics he reached the semifinal of the 800 metres, where he clocked in 1:56.0 minutes.[1] He became Norwegian 400 metres champion in 1928, 1929, 1930, 1931 and 1935,[2] and 800 metres champion in 1928, 1929, 1931, 1933, 1936 and 1937.[3] He represented the clubs SK Freidig and Oslo TF.[4]
His personal best time was 1:52.1 minutes, achieved in September 1935 in Stockholm.[5] In the 400 metres he had 48.6 seconds, achieved in September 1935 at Bislett stadion.[6]
After retiring he was a sports editor in the newspaper Morgenposten.[7] He died in 1959.[1]