diff --git a/src/84from.js b/src/84from.js
index 3eb6dea3c1..2345a46df5 100755
--- a/src/84from.js
+++ b/src/84from.js
@@ -440,6 +440,71 @@ function XLSXLSX(X, filename, opts, cb, idx, query) {
 			return text;
 		}
 	}
+
+	function processSheet(workbook, sheetid, sheetOpt) {
+		var range;
+		var sheetRes = [];
+		if (typeof sheetOpt.range === 'undefined') {
+			range = workbook.Sheets[sheetid]['!ref'];
+		} else {
+			range = sheetOpt.range;
+			if (workbook.Sheets[sheetid][range]) {
+				range = workbook.Sheets[sheetid][range];
+			}
+		}
+		// if range has some value then data is present in the current sheet
+		// else current sheet is empty
+		if (range) {
+			var rg = range.split(':');
+			var col0 = rg[0].match(/[A-Z]+/)[0];
+			var row0 = +rg[0].match(/[0-9]+/)[0];
+			var col1 = rg[1].match(/[A-Z]+/)[0];
+			var row1 = +rg[1].match(/[0-9]+/)[0];
+
+			var hh = {};
+			var xlscnCol0 = alasql.utils.xlscn(col0);
+			var xlscnCol1 = alasql.utils.xlscn(col1);
+			for (var j = xlscnCol0; j <= xlscnCol1; j++) {
+				var col = alasql.utils.xlsnc(j);
+				if (sheetOpt.headers) {
+					if (workbook.Sheets[sheetid][col + '' + row0]) {
+						hh[col] = getHeaderText(workbook.Sheets[sheetid][col + '' + row0].v);
+					} else {
+						hh[col] = getHeaderText(col);
+					}
+				} else {
+					hh[col] = col;
+				}
+			}
+			if (sheetOpt.headers) {
+				row0++;
+			}
+			for (var i = row0; i <= row1; i++) {
+				var row = {};
+				for (var j = xlscnCol0; j <= xlscnCol1; j++) {
+					var col = alasql.utils.xlsnc(j);
+					if (workbook.Sheets[sheetid][col + '' + i]) {
+						row[hh[col]] = workbook.Sheets[sheetid][col + '' + i].v;
+					}
+				}
+				sheetRes.push(row);
+			}
+		} else {
+			sheetRes.push([]);
+		}
+
+		// Remove last empty line (issue #548)
+		if (
+			sheetRes.length > 0 &&
+			sheetRes[sheetRes.length - 1] &&
+			Object.keys(sheetRes[sheetRes.length - 1]).length == 0
+		) {
+			sheetRes.pop();
+		}
+
+		return sheetRes;
+	}
+
 	filename = alasql.utils.autoExtFilename(filename, 'xls', opts);
 	alasql.utils.loadBinaryFile(
 		filename,
@@ -460,71 +525,44 @@ function XLSXLSX(X, filename, opts, cb, idx, query) {
 					...opts,
 				});
 			}
-			//		console.log(workbook);
-			var sheetid;
-			if (typeof opt.sheetid === 'undefined') {
-				sheetid = workbook.SheetNames[0];
-			} else if (typeof opt.sheetid === 'number') {
-				sheetid = workbook.SheetNames[opt.sheetid];
-			} else {
-				sheetid = opt.sheetid;
-			}
-			var range;
-			var res = [];
-			if (typeof opt.range === 'undefined') {
-				range = workbook.Sheets[sheetid]['!ref'];
-			} else {
-				range = opt.range;
-				if (workbook.Sheets[sheetid][range]) {
-					range = workbook.Sheets[sheetid][range];
-				}
-			}
-			// if range has some value then data is present in the current sheet
-			// else current sheet is empty
-			if (range) {
-				var rg = range.split(':');
-				var col0 = rg[0].match(/[A-Z]+/)[0];
-				var row0 = +rg[0].match(/[0-9]+/)[0];
-				var col1 = rg[1].match(/[A-Z]+/)[0];
-				var row1 = +rg[1].match(/[0-9]+/)[0];
-				//		console.log(114,rg,col0,col1,row0,row1);
-				//		console.log(114,rg,alasql.utils.xlscn(col0),alasql.utils.xlscn(col1));
-
-				var hh = {};
-				var xlscnCol0 = alasql.utils.xlscn(col0);
-				var xlscnCol1 = alasql.utils.xlscn(col1);
-				for (var j = xlscnCol0; j <= xlscnCol1; j++) {
-					var col = alasql.utils.xlsnc(j);
-					if (opt.headers) {
-						if (workbook.Sheets[sheetid][col + '' + row0]) {
-							hh[col] = getHeaderText(workbook.Sheets[sheetid][col + '' + row0].v);
-						} else {
-							hh[col] = getHeaderText(col);
-						}
-					} else {
-						hh[col] = col;
-					}
-				}
-				if (opt.headers) {
-					row0++;
-				}
-				for (var i = row0; i <= row1; i++) {
-					var row = {};
-					for (var j = xlscnCol0; j <= xlscnCol1; j++) {
-						var col = alasql.utils.xlsnc(j);
-						if (workbook.Sheets[sheetid][col + '' + i]) {
-							row[hh[col]] = workbook.Sheets[sheetid][col + '' + i].v;
+
+			// Check if we should process multiple sheets
+			var shouldProcessMultipleSheets =
+				opt.sheetid === '*' || (Array.isArray(opt.sheetid) && opt.sheetid.length > 0);
+
+			if (shouldProcessMultipleSheets) {
+				// Process multiple sheets and combine into a single array
+				res = [];
+				var sheetsToProcess = opt.sheetid === '*' ? workbook.SheetNames : opt.sheetid;
+
+				for (var s = 0; s < sheetsToProcess.length; s++) {
+					var currentSheetId =
+						opt.sheetid === '*'
+							? sheetsToProcess[s]
+							: typeof sheetsToProcess[s] === 'number'
+								? workbook.SheetNames[sheetsToProcess[s]]
+								: sheetsToProcess[s];
+
+					if (workbook.Sheets[currentSheetId]) {
+						var sheetData = processSheet(workbook, currentSheetId, opt);
+						// Add sheet name to each row
+						for (var r = 0; r < sheetData.length; r++) {
+							sheetData[r]._sheet = currentSheetId;
 						}
+						res = res.concat(sheetData);
 					}
-					res.push(row);
 				}
 			} else {
-				res.push([]);
-			}
-
-			// Remove last empty line (issue #548)
-			if (res.length > 0 && res[res.length - 1] && Object.keys(res[res.length - 1]).length == 0) {
-				res.pop();
+				// Process single sheet (original behavior)
+				var sheetid;
+				if (typeof opt.sheetid === 'undefined') {
+					sheetid = workbook.SheetNames[0];
+				} else if (typeof opt.sheetid === 'number') {
+					sheetid = workbook.SheetNames[opt.sheetid];
+				} else {
+					sheetid = opt.sheetid;
+				}
+				res = processSheet(workbook, sheetid, opt);
 			}
 
 			if (cb) {
diff --git a/test/test848.js b/test/test848.js
new file mode 100644
index 0000000000..24e5180b29
--- /dev/null
+++ b/test/test848.js
@@ -0,0 +1,136 @@
+if (typeof exports === 'object') {
+	var assert = require('assert');
+	var alasql = require('..');
+	var path = require('path');
+	var dirname = path.normalize(__dirname) + '/';
+} else {
+	var dirname = './';
+}
+
+describe('Test 848 - Multi-sheet XLSX import', function () {
+	it('1. Import all sheets using sheetid: "*"', function (done) {
+		alasql(
+			'select * from xlsx("' + dirname + 'test848.xlsx", {headers:true, sheetid:"*"})',
+			[],
+			function (data) {
+				// Should return a flat array with _sheet property on each row
+				assert(Array.isArray(data));
+				assert(data.length > 0);
+				// Check that _sheet property exists
+				assert(data[0]._sheet);
+				// Should have rows from both sheets
+				var sheet1Rows = data.filter(function (row) {
+					return row._sheet === 'Sheet1';
+				});
+				var sheet2Rows = data.filter(function (row) {
+					return row._sheet === 'Sheet2';
+				});
+				assert(sheet1Rows.length === 3);
+				assert(sheet2Rows.length === 4);
+				done();
+			}
+		);
+	});
+
+	it('2. Import multiple specific sheets using sheetid array', function (done) {
+		alasql(
+			'select * from xlsx("' + dirname + 'test848.xlsx", {headers:true, sheetid:?})',
+			[['Sheet1', 'Sheet2']],
+			function (data) {
+				// Should return a flat array with _sheet property
+				assert(Array.isArray(data));
+				assert(data.length === 7); // 3 + 4 rows
+				assert(data[0]._sheet);
+				done();
+			}
+		);
+	});
+
+	it('3. Import specific sheets by index using sheetid array', function (done) {
+		alasql(
+			'select * from xlsx("' + dirname + 'test848.xlsx", {headers:true, sheetid:?})',
+			[[0, 1]],
+			function (data) {
+				// Should return a flat array with _sheet property
+				assert(Array.isArray(data));
+				assert(data.length === 7); // 3 + 4 rows
+				assert(data[0]._sheet === 'Sheet1');
+				done();
+			}
+		);
+	});
+
+	it('4. Original single sheet behavior should still work', function (done) {
+		alasql(
+			'select * from xlsx("' + dirname + 'test848.xlsx", {headers:true})',
+			[],
+			function (data) {
+				// Should return an array (original behavior)
+				assert(Array.isArray(data));
+				assert(data.length === 3);
+				// Should not have _sheet property
+				assert(!data[0]._sheet);
+				done();
+			}
+		);
+	});
+
+	it('5. Original single sheet with explicit sheetid should still work', function (done) {
+		alasql(
+			'select * from xlsx("' + dirname + 'test848.xlsx", {headers:true, sheetid:"Sheet2"})',
+			[],
+			function (data) {
+				// Should return an array (original behavior)
+				assert(Array.isArray(data));
+				assert(data.length === 4);
+				assert(data[3].five === 800);
+				// Should not have _sheet property
+				assert(!data[0]._sheet);
+				done();
+			}
+		);
+	});
+
+	it('6. Query rows from specific sheet using WHERE clause', function (done) {
+		alasql(
+			'select * from xlsx("' +
+				dirname +
+				'test848.xlsx", {headers:true, sheetid:"*"}) WHERE _sheet = "Sheet2"',
+			[],
+			function (data) {
+				// Should only return rows from Sheet2
+				assert(Array.isArray(data));
+				assert(data.length === 4);
+				assert(
+					data.every(function (row) {
+						return row._sheet === 'Sheet2';
+					})
+				);
+				done();
+			}
+		);
+	});
+
+	it('7. Count rows per sheet', function (done) {
+		// First get the data, then query it
+		alasql(
+			'SELECT * FROM xlsx("' + dirname + 'test848.xlsx", {headers:true, sheetid:"*"})',
+			[],
+			function (allData) {
+				// Now count using a separate query
+				var counts = alasql('SELECT [_sheet], COUNT(*) FROM ? GROUP BY [_sheet]', [allData]);
+				assert(Array.isArray(counts));
+				assert(counts.length === 2);
+				var sheet1 = counts.find(function (row) {
+					return row._sheet === 'Sheet1';
+				});
+				var sheet2 = counts.find(function (row) {
+					return row._sheet === 'Sheet2';
+				});
+				assert(sheet1['COUNT(*)'] === 3);
+				assert(sheet2['COUNT(*)'] === 4);
+				done();
+			}
+		);
+	});
+});
diff --git a/test/test848.xlsx b/test/test848.xlsx
new file mode 100644
index 0000000000..44aea2dc86
Binary files /dev/null and b/test/test848.xlsx differ