This study extends previous research on the effects of executive board diversity by examining the relationship between age-, gender- and nationality diversity on firm performance in the Netherlands. Based on a sample of 79 Dutch listed firms studied over the period 2010-2015, this study reports a positive link between board diversity and firm performance. Firm performance is, hereby, estimated using a forward-looking market performance measure (Tobin’s Q) and a backward-looking accounting measure (ROA).