:Monosodium tartrate

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| ImageFile = Monosodium tartrate.svg

| ImageFileL1 = Bitartrate-ion-3D-balls.png

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| IUPACName = Sodium hydrogen tartrate

| OtherNames = Sodium bitartrate; E335

| SystematicName = Sodium 3-carboxy-2,3-dihydroxypropionate

| Section1 = {{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|??}}

| CASNo=526-94-3

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| UNII = 75E63I9H07

| PubChem=23690454

| SMILES=C(C(C(=O)[O-])O)(C(=O)O)O.[Na+]

| EINECS = 238-470-6

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| ChemSpiderID = 10239

| InChI = 1/C4H6O6.Na/c5-1(3(7)8)2(6)4(9)10;/h1-2,5-6H,(H,7,8)(H,9,10);/q;+1/p-1

| InChIKey = NKAAEMMYHLFEFN-REWHXWOFAB

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| StdInChI = 1S/C4H6O6.Na/c5-1(3(7)8)2(6)4(9)10;/h1-2,5-6H,(H,7,8)(H,9,10);/q;+1/p-1

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| StdInChIKey = NKAAEMMYHLFEFN-UHFFFAOYSA-M

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| Formula=C₄H₅NaO₆

| MolarMass=172.07 g/mol

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Monosodium tartrate or sodium bitartrate is a sodium acid salt of tartaric acid. As a food additive it is used as an acidity regulator and is known by the E number E335. As an analytical reagent, it can be used in a test for ammonium cation which gives a white precipitate.{{Cite journal |last1=Younes |first1=Maged |last2=Aquilina |first2=Gabriele |last3=Castle |first3=Laurence |last4=Engel |first4=Karl-Heinz |last5=Fowler |first5=Paul |last6=Frutos Fernandez |first6=Maria Jose |last7=Fürst |first7=Peter |last8=Gürtler |first8=Rainer |last9=Gundert-Remy |first9=Ursula |last10=Husøy |first10=Trine |last11=Mennes |first11=Wim |last12=Shah |first12=Romina |last13=Waalkens-Berendsen |first13=Ine |last14=Wölfle |first14=Detlef |date=2020-03-11 |title=Re-evaluation of l(+)-tartaric acid (E334), sodium tartrates (E335), potassium tartrates (E336), potassium sodium tartrate (E337) and calcium tartrate (E354) as food additives |journal=EFSA Journal |volume=18 |issue=3 |pages=e06030 |doi=10.2903/j.efsa.2020.6030 |issn=1831-4732 |pmc=7448015 |pmid=32874248 }}{{Cite journal |last1=Rusyniak |first1=Daniel E. |last2=Durant |first2=Pamela J. |last3=Mowry |first3=James B. |last4=Johnson |first4=Jo A. |last5=Sanftleben |first5=Jayne A. |last6=Smith |first6=Joanne M. |date=2012-08-28 |title=Life-threatening hyperkalemia from cream of tartar ingestion |journal=Journal of Medical Toxicology|volume=9 |issue=1 |pages=79–81 |doi=10.1007/s13181-012-0255-x |issn=1937-6995 |pmc=3570668 |pmid=22926733 }}{{Cite journal |date=January 11, 2017 |title=Potassium Acid Tartrate Handling/Processing |url=https://www.ams.usda.gov/sites/default/files/media/Potassium%20Acid%20Tartrate%20TR%20Final%2001%2011%2017.pdf |journal=Technical Evaluation Report |type=PDF |volume=15 |issue=16 |pages=11 |via=United States Department of Agriculture}}