Lucas van Foreest (born 3 March 2001) is a Dutch chess grandmaster.

[1] He achieved his first International Master (IM) norm at the Dutch Team Competition, from September to October 2015.

[7] Van Foreest competed in the Tata Steel Challengers in January 2018, placing eleventh with a score 5½/13 (+3–5=5).

He shared first with Erwin l'Ami and Erik van den Doel on 7/9, achieving his third GM norm in the process.

[10] Van Foreest competed in the Tata Steel Challengers again in January 2019, scoring 6/13 (+2–3=8) for a ninth-place finish.

He tied for first with 5/7 (+3–0=4), and defeated his elder brother Jorden on tiebreak to win the title.