Doug Tietjens
| Date of birth | 7 February 1984 | ||||||||||||||||||||||||||||||||||||
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| Place of birth | Kalgoorlie, Western Australia | ||||||||||||||||||||||||||||||||||||
| Height | 1.85 m (6 ft 1 in) | ||||||||||||||||||||||||||||||||||||
| Weight | 101 kg (15 st 13 lb) | ||||||||||||||||||||||||||||||||||||
| School | Palmerston North Boys' High School | ||||||||||||||||||||||||||||||||||||
| University | University of Otago Massey University | ||||||||||||||||||||||||||||||||||||
| Rugby union career | |||||||||||||||||||||||||||||||||||||
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Doug Tietjens (born 7 February 1984) is a former Australian-born New Zealand rugby union player who last played as a flanker for Taranaki in the National Provincial Championship, having shifted north to the province after 45 matches with Manawatu from 2008 to 2012.