Thomas Allen Shields (born July 11, 1991) is an American swimmer who swims for the University of California, Berkeley. In 2016, Shields placed second in the 200 m butterfly at the US Olympic Swimming Trials. He currently holds the short-course American records in the 100-meter, and 200-meter butterfly events.
At the 2011 NCAA Division 1 Championships, Shields won the 100-yard backstroke (45.02), second place in the 100-yard butterfly (44.91), and third in the 200-yard butterfly (1:41.20). He anchored the second place 4×50-yard freestyle relay, the 4×100-yard freestyle relay, and 4×200-yard freestyle relay. He swam the butterfly leg for the medley relays.
Shields swam for Cal at the 2012 NCAA Swimming Championships. Shields finished first in the 100-yard Butterfly (44.76) and the 100-yard backstroke (44.86). He finished second to teammate Will Hamilton in the 200-yard Butterfly (1:41.07). He anchored the 400-yard Freestyle relay with a split of 41.79, and started the 800 Freestyle Relay (splitting a 1:33.72). He swam the butterfly leg in both the 200-yard Medley Relay (19.80 split) and the first-place finishing 400 Medley Relay (splitting a 43.56).