Niels Poul "Tist" Nielsen (25 December 1891 – 9 August 1962) was a Danish footballer who is the joint all-time top goalscorer for the Denmark national team with 52 goals in 38 matches.

As a young boy, Nielsen would sneak in to watch football games without paying, thus becoming a gratist (free rider), abbreviated to "Tist".

Born in Copenhagen, Nielsen started playing football with Kjøbenhavns Boldklub (KB), where he spent his entire senior career.

Denmark later successfully defended their Olympic silver medal, losing 2–4 to Great Britain in the final game, without Nielsen in the team.

After the 1912 Olympics, Nielsen started scoring goals for the Denmark national team at a record-setting pace, while guiding KB to two Danish championships in a row during 1913 and 1914.