Château-Gaillard (French pronunciation: [ʃɑto ɡajaʁ]) is a commune in the eastern French department of Ain.

The river Albarine forms most of the commune's southern border.

Historical population

Year	Pop.	±% p.a.
1968	439	—
1975	698	+6.85%
1982	832	+2.54%
1990	1,027	+2.67%
1999	1,370	+3.25%
2007	1,704	+2.76%
2012	1,881	+2.00%
2017	2,138	+2.59%
Source: INSEE

• Communes of the Ain department

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