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In this paper the mechanical behaviour of 1050 H14 aluminium alloy is investigated under in-plane biaxial fatigue. Both experimental and theoretical methods are applied to validate multiaxial fatigue criteria. In order to cover a large range of multiaxial stress states, a new biaxial testing machine was developed and applied in the fatigue tests with a specially designed cruciform specimen. Different multiaxial fatigue criteria, including those based on octahedral shear stress amplitude combined with hydrostatic pressure, and more recent models based on the critical plane approach are evaluated. A modified Minimum Circumscribed Ellipse (MCE) approach is proposed that offers a possible compromise and seems to significantly improve the assessments.