Thomas Yan Sun-kong (Chinese: 甄燊港) is a Hong Kong politician and former journalist.

With Lau, he joined the organisation of the Anti-Tung Solidarity against the unpopular Chief Executive Tung Chee-hwa formed by Stephen Shiu.

In 2008 when Emily Lau and other Frontier members decided to merge into the Democratic Party, Yan opposed the decision and set up a new group with the same name in 2010, where he has become the convenor since.

The Frontier became one of the constituent groups of the People Power led by Wong Yuk-man and funded by Stephen Shiu in 2011.

One of the notable candidates was Raymond Chan who ran against former Democratic Party chairman Lee Wing-tat in Lai Wah.