Nielna Christiane Mortensen
- Born: 12 Jun 1895, Frøstrup, Tømmerby Sogn, Vester Han Herred, Thisted Amt
- Marriage (1): Johan Mikael Gundersen on 13 Feb 1914 in Tømmerby Kirke
- Died: 24 Nov 1961, Død i bybussen i Aalborg ud for Aalborg Amtssygehus at age 66
- Buried: 4 Dec 1961, Tømmerby Kirkegård
 Other names for Nielna were Elna Gundersen, Nielna Christiane Gundersen and Nielna Kristiane Mortensen.
Nielna married Johan Mikael Gundersen, son of Peder Kristian Gundersen and Engel Malene Johansen, on 13 Feb 1914 in Tømmerby Kirke. (Johan Mikael Gundersen was born on 24 Oct 1890 in Hjortdal Sogn, Vester Han Herred, Thisted Amt, died in 1971 and was buried in 1971 in Tømmerby Kirkegård.)
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