Oswald Jacob Groenings (later Birkbeck, 20 May 1880 – 24 March 1965) was a British track and field athlete who competed in the 1908 Summer Olympics.
Groenings born in Middlesbrough, finished second behind Robert Stronach in the 120 yards hurdles event and second behind Con Leahy in the high jump event at the 1906 AAA Championships.
He was eliminated in the semi-finals of the 400 metre hurdles competition after finishing second in his heat.
He also participated in the 110 metre hurdles event and was eliminated in the semi-finals again after finishing fourth in his heat.
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