Neptunium(V) fluoride

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| IUPACName = Neptunium(V) fluoride

| OtherNames = Neptunium pentafluoride

| Section1 = {{Chembox Identifiers

| CASNo = 31479-18-2

| PubChem = 165359232

| SMILES = F[Np](F)(F)(F)F

| StdInChI_Ref =

| StdInChI = 1S/5FH.Np/h5*1H;/q;;;;;+5/p-5

| StdInChIKey = QROYIGAVOZBRHJ-UHFFFAOYSA-I

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|Section2={{Chembox Properties

| Formula = NpF₅

| MolarMass = 332 g/mol

| Appearance = Bluish-white solid

| Density =

| Solubility =

| MeltingPt = 318 °C

| MeltingPt_notes = (dec.)

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|Section3={{Chembox Structure

| CrystalStruct = Tetragonal, tI12

| SpaceGroup = I4/m, No. 87{{cite journal|doi=10.1107/S0365110X49001016|title=Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types|journal=Acta Crystallographica|volume=2|issue=6|pages=388–390|year=1949|last1=Zachariasen|first1=W. H.|doi-access=free}}

| LattConst_a = 0.65358 nm

| LattConst_c = 0.44562 nm

| UnitCellFormulas = 2

| UnitCellVolume =0.1904 nm³

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|Section5={{Chembox Thermochemistry

| DeltaHf = −1941 ± 25 kJ/mol

{{cite book

| title = The Chemistry of the Actinide and Transactinide Elements |doi=10.1007/1-4020-3598-5_9

| editor1-last = Morss|editor2-first = Norman M.

| editor2-last = Edelstein

| editor3-last = Fuger|editor3-first = Jean

| last = Haire|first = Richard G.

| publisher = Springer Science+Business Media

| year = 2006

| isbn = 1-4020-3555-1

| location = Dordrecht, The Netherlands

| edition = 3rd

|pages= 730–736|chapter=Neptunium }}

| Entropy = 200 ± 15 J/mol·K

| DeltaGf = −1834 ± 25 kJ/mol

| HeatCapacity = 133 ± 8 J/mol·K

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Neptunium(V) fluoride or neptunium pentafluoride is a chemical compound of neptunium and fluorine with the formula NpF₅.