UDP

• Ulster Democratic Party, in Northern Ireland
• União Democrática Popular (Popular Democratic Union (Portugal))
• Unidad Democrática y Popular (Democratic and Popular Union), a former Bolivian umbrella party
• United Democratic Party (disambiguation), multiple organisations

• Undecaprenyl phosphate, a bacterial cell membrane carrier lipid
• Uridine diphosphate, an organic chemical
• User Datagram Protocol, a network communications method
• User Defined Primitive, a construct in Verilog
• Usenet Death Penalty, a discussion group disciplinary response
• Universality–diversity paradigm

• Unit Deployment Program, a military assignment system
• Unitary development plan, a land use planning system
• Universidad Diego Portales (Diego Portales University), in Chile

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